Music

Don't anticipate Jack Harlow to force out a remix of his blockbuster jam "Lovin On Me" ... that track is a 1 of 1!!!

ICYMI ... Jack revealed to TMZ Hip Hop earlier this week that his lovable dog would remain nameless -- and he also told us there's a fat chance there will be a sequel to "Lovin On Me" -- his biggest hit to date!!!

You can see Jack pause for a moment and mentally debate on the possibility of remixing a track before shutting down the idea completely.

If it ain't broke, no need to fix it or even reach for the glue ... the song's been killing since releasing in November with nearly 500 million Spotify streams and 75 million plays on YouTube!!!

It also returned to No. 1 on the Billboard Hot 100 for the 6th time this week -- which you gotta admit, has boosted Jack's skin in the music game.

Not even new songs from Beyoncé and Kanye West could slow down his bop.

El video filtrado de Bobbi Althoff casi rompió Internet recientemente y aunque ella salió a decir que no podía ser más falso, TMZ sabe cómo la tecnología engañó a miles de personas.

Paul Dawes, consejero delegado de More.ai, explica a TMZ cómo funciona la inteligencia artificial. Dice que esta busca entre todas las imágenes 2D disponibles para encontrar patrones y crear contenido original. En el caso de Bobbi, ya hay un montón de contenido en línea de ella que puede ser usado por la IA para crear un video falso.

Lo mismo pasa con todas las celebridades, políticos y entidades de marca que son objetivos susceptibles de ser manipulados por la IA.

A los programas de IA les cuesta más falsificar imágenes en 3D, pero a juzgar por la rapidez con la que evoluciona la tecnología, es solo cuestión de tiempo para que también lo hagan.

Más aún, muchos de estos programas de IA son de código abierto, por lo que incluso si una empresa cierra, el código de fuente abierto sigue estando isponible para que el público lo utilice. Vaya.

Por supuesto, Paul Dawes nos recuerda que las redes sociales tienen una gran responsabilidad en el control de los contenidos que se distribuyen. Por desgracia, parece que las plataformas en línea están siendo arrasadas con todo tipo de contenido ofensivo en este momento, sin mucha supervisión.

Por ahora, dice que lo mejor que podemos hacer es ganar suficiente tiempo como para que las herramientas reguladoras se pongan al día e impidan que las personas sean objeto de creación de imágenes sexualmente explícitas.

Bobbi Althoff's leaked AI deepfake video nearly broke the internet recently ... and even though she called it fake as hell, TMZ knows how the technology fooled thousands.

Paul Dawes, CEO of More.AI, gave TMZ the lowdown ... saying it scours all available 2D footage to find patterns to create original content. In Bobbi's case, there's already a ton of online content for AI to use as a basis for creating the deepfake vid.

The same goes for other celebs, politicians, and any branded entities ... all prime targets for AI manipulation.

AI programs have a harder time deepfaking 3D images ... but judging how quickly things are evolving with the technology, it's only a matter of time before it masters that too.

What's more ... a lot of these AI programs are open-source, so even if a company shuts down, the open-source code is still available for the public to use. Yikes.

Of course, he reminds us social media has a big responsibility in controlling the content being distributed. Unfortunately, online platforms are inundated with all sorts of offending content without much oversight.

For now, he says the best we can do is buy enough time so regulatory tools can prevent people from being subjected to sexually explicit images of their likenesses.

Of course, AI has already violated the privacy of Bobbi and many others ... so the misuse of AI-generated content is definitely a concerning issue in the new age of the internet.

French Montana has returned to his mixtape roots with his new “Mac & Cheese 5” project and it’s catering to every kind of fan out there … there’s a version bursting with 126 tracks!!!

The Diamond-selling rapper connected with TMZ Hip Hop on Friday and eased everyone’s fears that he wasn’t out to spam streaming companies with a massive hack job.

French tells us the tracklist is simple science he adopted from Taylor Swift when she surpassed every artist on the PLANET by recreating her old hits … as we know, made her catalog boom as a result.

The Bronx native also credited City Girl JT and her team for making her “Sideways” banger accessible in multiple formats and figured that was the new wave.

French explains “MC5” has 21 songs on 5 different versions … the standard, acapella, and instrumentals for the DJs and sped-up and slowed installments for TikTok, which add up to its 126-song grand tally!!!

Fans not complaining noticed “MC5” features Kanye West on not one but TWO tracks — perfect timing with his “Vultures 1” currently dominating the Billboard charts.

French says Ye was in his corner when he first got signed so he’s not about to abandon him when his antisemitic rants were making him a liability to many.

Travis Kelce tiene que estar feliz de que Taylor Swift y Katy Perry ya no estén peleadas porque hace algún tiempo tuvo que hacer una difícil elección entre ellas y como que le dio el visto bueno a Katy.

Ha estado circulando una vieja entrevista de Travis en 2016, que hizo con AfterBuzz TV, a raíz de que Katy se apareció en el concierto de Taylor en Australia el viernes y en el clip, Travis está jugando el clásico juego "FMK" (Fuck, Marry, Kill), pero la versión PG (Kiss, Marry, Kill).

Se le dieron 3 opciones a Travis: Taylor, Katy y Ariana Grande y después de que a regañadientes optara por "matar" a Ariana, diciendo que pensaba que era genial, se quedó con Taylor y Katy y eligió a Katy para el matrimonio y a Taylor para besar.

Es súper tonto y todo, pero poco sabía en ese entonces de que iba a terminar con una de estas señoras, aunque obviamente también se cruzó con Katy, en compañía de Taylor.

Es bastante divertido ver al Travis del pasado, obviamente, la referencia a Taylor es el punto alto aquí, pero su peinado también es bastante divertido de apreciar. Hoy en día, se peina de forma normal.

En cualquier caso, parecía bastante entusiasmado con casarse con Katy en ese entonces, lo cual es interesante porque en 2016 las cantantes aún se tenían bronca.

Por supuesto, las dos estrellas del pop han remendado su relación desde entonces, a tal punto de que Katy apareció cantando "Bad Blood" el viernes en el primer show de Taylor en Sídney: la última señal de que ahora están bien.

Katy estuvo cantando desde la carpa VIP, donde se unió a Rita Ora y Travis. Así que sí, Travis estuvo pasando el rato con la mujer que alguna vez prefirió sobre Taylor.

No está claro si Travis vio este divertido clip con Katy el viernes durante el concierto, pero francamente, lo dudamos y es totalmente posible que ni siquiera lo recuerde.

Fue hace un montón de tiempo y ahora claramente está muy feliz con Taylor.

De todos modos, Travis y Taylor siguen yendo en serio en la medida que ella retoma su gira "Eras" y él celebra otro campeonato del Super Bowl con los Kansas City Chiefs. Si Katy está en la mezcla o no, él solo tiene ojos para Tay Tay por estos días.

Benzino thinks he destroyed Eminem in their most recent battle -- and is dancing on Slim Shady's grave ... at least that's how he sees things, anyway.

In a new interview with "Art Of Dialogue," Benzino maintained he nailed Em's coffin shut with his "Rap Elvis" diss ... all because Marshall is still delinquent on responding.

Em did respond to Benzino's first shot of 2024 with a diss of his own but the former Source magazine owner threatened to release another one if he continued to be met with radio silence.

He also wants the history books to call him "The Eminem Slayer" ... it's been 20 years and Benzino claims he's the only rapper with the cojones to wage war with Marshall Mathers for so long.

Em's loyal Stans also caught a stray for being "soft and cuddly" but they called him much worse after the beef caused him to break down crying during his latest "Drink Champs" interview.

According to Benzino, crying helps him balance out his violent emotions and he says his vulnerability is immune to any of Em's future disses. Basically, he's not going out the way B-Rabbit beat Papa Doc.

Travis Kelce has to be happy Taylor Swift and Katy Perry are no longer beefing ... 'cause he once had to make a tough choice between them, and he kinda gave the nod to Katy.

An old interview with Travis from 2016 that he did with AfterBuzz TV is being resurfaced and recirculated in the wake of Katy crashing Taylor's concert down in Australia Friday ... and in the clip, Travis is playing the classic game "FMK," but the PG-version ... Kiss, Marry, Kill.

Travis is given 3 options ... Taylor, Katy and Ariana Grande ... and after he reluctantly chooses to "kill" Ariana -- noting he actually thinks she's great -- he was left with Taylor and Katy as the final 2 ... and he picks Katy for marriage and Taylor for kissing.

It's super silly and all in good fun ... but little did he know back then, he'd end up with one of these ladies -- although, he obviously crossed paths with Katy as well in the company of TS.

It's pretty funny to see Travis in this throwback -- obviously, the Taylor reference is the stand-out here -- but his flowing hairdo is also pretty wild to see. These days, he rocks a regular fade.

In any case, he seemed pretty stoked on marrying Katy at the time ... which is interesting -- because in 2016, she and Katy were still feuding and had bad blood back then.

Of course, the two pop stars have since patched up their relationship ... to the point where Katy was singing "Bad Blood" Friday at Taylor's first Sydney show -- the ultimate sign they're all good now.

Katy was singing along from the VIP tent ... where she was joined by Rita Ora and Travis. So yes, Travis was standing next to and hanging out with the woman he was once smitten with over Taylor.

Unclear if Travis brought this funny clip up with Katy Friday during the concert ... but frankly, we doubt it ... and it's entirely possible he doesn't even remember this.

It was a lifetime ago ... and he's clearly very happy with Taylor now.

Anyway, Travis and Taylor are still going strong as her "Eras" tour picks back up and he celebrates another Super Bowl championship with the Kansas City Chiefs. Whether Katy's in the mix there with them or not ... he's only got eyes for Tay Tay these days.

Los fans de Ariana Grande se están acercando un poco más a su novio Ethan Slater y todo lo que bastó fue un viejo clip donde aparece mostrando sus músculos.

Un fornido Ethan aparece sin camiseta en un sketch de hace unos años, y ahora sus fans están apoyando la relación con su coprotagonista en "Wicked", ¡porque el tipo se ve bien!

Ethan ha estado ocultando su físico en Broadway y en sus salidas públicas con Ariana. Al menos hasta ahora, no habíamos visto su cuerpo. Sin embargo, ha vuelto a circular este video de 2017, donde aparece luchando con su compañero de piso por el dinero del alquiler. Más importante aún, estamos echando un vistazo a su torso desnudo y se ve marcado.

Abdominales, bíceps, pectorales, lo que sea, Ethan lo tiene todo en este registro, que fue inocuamente reflotado en Internet esta semana, cuando los usuarios de X lo publicaron y trataron de hacerlo parecer como algo que no era.

La verdadera historia aquí, sin embargo, es cómo los fans de Ariana están babeando por Ethan y empezando a ver lo que ella ve en él.

Recuerden, la pareja se hizo súper cercana cuando filmaron "Wicked" juntos y decidieron divorciarse de sus respectivos cónyuges para iniciar una relación en toda regla. Es seguro decir, que la línea de tiempo se veía algo desordenada cuando todo esto se juntó.

Como les hemos dicho, Ariana y Ethan están pasando casi todo el tiempo juntos y más en privado en lugar de galantear por la ciudad, aunque salen en público de vez en cuando.

Ahora que hemos visto más del cuerpo de Ethan no es de extrañar que Ariana lo quiera todo para ella y ese es un el consenso de sus fans. ¡Dicen que Bob Esponja está bueno!

Para aquellos que tenían dudas, las fotos sin camisa los están haciendo cambiar de opinión.

Ariana Grande fans are coming around on her boyfriend Ethan Slater ... and all it took was an old clip of him showing off his muscles.

A ripped Ethan is shirtless in a resurfaced skit from a few years back, and now Ariana stans are giving her props for getting with her "Wicked" costar -- 'cause the dude looks good!

Ethan's been hiding a jacked physique on Broadway and during his public outings with Ariana ... until now, we haven't seen what his bod looks like. However, this old short film he was in from 2017 has been making the rounds anew, which features him wrestling his roommate over rent money. More importantly, we're getting a look at his bare torso ... and it's chiseled.

Abs, biceps, pecs ... you name it, Ethan's got it in this footage ... which had been innocuously floating around the internet until this week, when users on X posted it and tried to make it look like something it wasn't.

The real story here, though, is how Ariana fans are drooling over Ethan ... and starting to see what she sees in him.

Remember ... Ariana and Ethan got super close when they were filming "Wicked" together and they both divorced their spouses and got into a full-blown relationship.

As we've told you, Ariana and Ethan are spending almost all of their time together ... and they prefer spending it in private as opposed to gallivanting around town -- although, they do go out in public from time to time.

Now that we've seen more of Ethan's body ... it's no wonder Ariana wants him all to herself ... and that's kinda the consensus among her fans too. They're saying SpongeBob's a hunk!

For those who were on the fence before, the shirtless shots are pushing them over the edge.

Kanye West and Bianca Censori are doing the fashion thing in Milan right now -- and if you're wondering what Bianca was wearing ... well, it basically amounted to a skimpy tarp.

The couple posed for cameras Friday for Fashion Week, where they put on their best attire and stood shoulder-to-shoulder as Italy's "it" couple -- and by that ... we mean fabric and clothing material, 'cause these aren't the most stylish getups, at least in our eyes anyway.

Take a look for yourself, specifically as it pertains to Bianca -- who's in a VERY revealing ensemble, which looks more like a bag made of leather than an actual outfit.

Indeed, she appears to be butt-ass naked under there ... and when you see her from the side, you'll see a lot of skin, even more than usual you might say. Ye is just ... well, Ye.

The only thing to really note about this look here is that he's still going strong on his permanent tooth grill thing -- a titanium plate that's cemented at the top of his mouth.

Truth be told, the real star here is Bianca ... who continues to turn heads with her eye-popping costumes -- frankly, that's sorta the best way to describe them at this point.

Ye's definitely into her bod ... and he seems insistent on showing it off to the world, too.

What she's wearing here isn't too different from what she was rocking on Thursday at Kanye's 'Vultures' listening event -- where he seemed to have a packed stadium full of Italians ready to jam out. That 'fit made us blush, this one's making us melt!

Anyway, they did their thing at the show ... and went out to dinner afterward, where you could really see what BC looked like from the front and back. Solid angles here, for sure.

She's also still rocking her new bangs ... but that's the last thing anyone's noticing about her.

It's funny ... so much of Bianca has been revealed at this point -- figuratively and literally -- and just when we think we've seen it all, she somehow tops herself and shows even more.

Then again ... she can be pretty shy at times -- completely covering up, and ducking away from cameras. On Friday, however, she was more than ready for the spotlight with Ye.

Kanye West y Bianca Censori están luciendo sus extravagantes atuendos en Milán y si se preguntan qué está usando Bianca, ahora, bueno, se redujo a una especie de body.

La pareja posó frente a las cámaras el viernes para la Semana de la Moda, exhibiendo sus mejores atuendo como la pareja "deseada" de Italia, y con eso nos referimos, a la tela y su material, que es lo más elegante del look, al menos desde nuestra perspectiva.

Echa un vistazo tú mismo, específicamente en lo que respecta a Bianca, que está usando un conjunto muy revelador, que parece más una bolsa de cuero que un traje real.

De hecho, parece que lleva el trasero desnudo debajo y de perfil, se ve mucha, mucha piel, incluso más de lo habitual, podría decirse. Ye, en tanto, es solo... Ye.

Lo único que hay que destacar de este look es que sigue con sus dientes permanentes, una placa de titanio que está cementada en la parte superior de la boca.

A decir verdad, la verdadera estrella aquí es Bianca, que sigue girando cabezas con sus llamativos trajes, francamente, esa es la mejor manera de describirlos en este momento.

Ye se ve seguro con su estilo e insiste en compartirlo con el mundo, también.

Lo que lleva aquí no es muy diferente de lo que llevaba el jueves en el evento de escucha de Kanye "Vultures", donde parecía tener un estadio lleno de italianos listos para improvisar. Aquel conjunto nos hizo sonrojar, ¡este nos hace derretir!

De todos modos, hicieron lo suyo en el show y salieron a cenar después, donde realmente se podía ver a Bianca de frente y de espalda. Ángulos sólidos, sin duda.

También sigue llevando su nuevo flequillo, pero eso es lo último que se nota en ella.

Es curioso, a pesar de que Bianca ya ha revelado mucho, en sentido figurado y literal, justo cuando pensamos que hemos visto todo, de alguna manera se supera a sí misma y muestra aún más.

Por otra parte... a veces puede ser bastante tímida, tapándose por completo y esquivando las cámaras. El viernes, sin embargo, estaba más que lista para ser el centro de atención con Ye.

Travis Kelce estuvo en la primera fila para apoyar a su novia Taylor Swift, mientras ella se tomaba el escenario de nuevo, y Taylor se lo agradeció cariñosamente después del show.

El jugador de los Kansas City Chiefs fue uno de los miles de asistentes al Accor Stadium de Sydney el viernes, donde T-Swift dio inicio a una nueva serie de conciertos de cara al fin de semana. Al igual que otros shows donde él ha estado presente, los fans se volvieron locos.

Hay un montón de videos circulando en X que muestran a Travis Kelce de camino a su lugar en el estadio, mientras los Swifties pierden la cabeza gritando como locos.

Travis hizo eco de toda la atención, aplaudiendo y saludando a las jóvenes a su paso, flanqueado por la seguridad a su lado, por supuesto. También lo acompañaba un amigo, Ross Travis, ex jugador de los Chiefs, que está acompañando a Travis en este viaje a Australia. El padre de Taylor, Scott, también estaba en la tienda VIP donde fue Trav.

Por cierto, había otros famosos en el espectáculo, como Katy Perry y Rita Ora. Travis se tomó una foto con esta última y, ¡llevaba puesta su pulsera de la amistad! Después del concierto, los fans pudieron ver cómo Taylor le daba un beso a su hombre.

Mientras Travis y compañía miraban, Taylor hizo lo suyo sobre el escenario y encendió el estadio como lo hace normalmente. Los mejores momentos quedaron registrados en fotos.

Cuando se trata de Travis, el tipo está obviamente comprometido con la relación. Ya había viajado antes para ver actuar a Taylor y ahora lo hizo de nuevo en Australia. Tampoco ha perdido el tiempo desde que llegó, ambos pasearon por el zoológico apenas llegó.

No es poca cosa. Como hemos informado, Travis hizo un largo viaje para ver a la súper estrella del pop. Comenzó la noche del martes cuando se subió a un avión privado en Los Ángeles después de cenar en Nobu Malibu.

Primero voló a Hawái y luego a Sydney, donde fue fotografiado bajando del avión y subiendo a un SUV. Un largo viaje, sin duda, y sin embargo, él se las arregló para ir directo al zoológico de Sydney de paseo con su chica.

Esta es la segunda vez que Trav viaja para ver a Taylor, pero no se preocupen, ella ha hecho lo mismo por él. Recuerden, hace poco voló desde Tokio hasta Las Vegas para estar en el Super Bowl y estuvo allí animándolo, mientras los Chiefs ganaban el campeonato.

Algunos se preguntaban si iban a ser capaces de mantener el ritmo después de la temporada de fútbol, y hasta ahora, parece que sí. No te embarcas hasta Australia si no estás comprometido con la relación.

Sabemos que Travis estará allí durante el fin de semana, pero la pregunta es, ¿será su roadie durante el resto de la gira? Ella tiene espectáculos en Singapur en los próximos días, en el marco de su gira "Eras".

La vieja enemistad entre Katy Perry y Taylor Swift está enterrada, algo que ya sabíamos, pero que fue doblemente confirmado con la aparición de Katy en su show en Australia, en donde cantó una canción en particular.

La estrella del pop fue una de las famosas que asistió al primer concierto de Taylor Swift en Sydney, donde apareció colgando una credencial VIP con Rita Ora y, por supuesto, Travis Kelce, quien voló desde Estados Unidos para estar con su novia.

La presencia de Katy es interesante considerando que solían tenerse bronca con Tay Tay.

Por eso, que estuviera cantando "Bad Blood" -que siempre se ha rumoreado que se trata de Katy- fue algo fascinante de ver. Mientras Taylor la interpretaba sobre el escenario, ella fue grabada desde la multitud. Es el colmo de la ironía y la prueba de que ahora están bien.

Katy incluso publicó una foto con Taylor después del show y se veían muy amigas.

Por si no lo saben, toda la saga se remonta a 2014 más o menos, cuando Taylor lanzó "Bad Blood" en alusión al quiebre de una amistad, y la mayoría de la gente asumió que se refería a Katy, explicando que era un problema de personal.

Taylor habló de ello en el momento sin nombrar a Katy Perry: "Ella hizo algo horrible. Yo estaba como, 'oh, solo somos directamente enemigas'. Y ni siquiera se trataba de un chico. Tenía que ver con negocios. Básicamente, intentó sabotear toda una gira".

Taylor Swift añadió: "Ella trató de contratar a un montón de gente de debajo de mí. Y yo soy sorprendentemente no-confrontacional -no creerían lo mucho que odio el conflicto. Así que ahora tengo que evitarla. Es incómodo y no me gusta".

Katy terminó respondiendo con su propia canción, y llegó a decir que su disputa fue sobre los bailarines de apoyo, esto es, que Katy contrató a algunos de los empleados de Taylor.

Al final, terminaron haciendo las paces. Taylor lanzó la canción y video "You Need to Calm Down", en la que Katy hizo un cameo y estaba claramente bien con ella de nuevo.

On this episode of The TMZ podcast ...

'Real Housewives Of Beverly Hills' star Brandi Glanville is threatening to sue Andy Cohen over alleged sexual misconduct from her experience on 'Girls Trip.'

Kelly Rowland is continuing to dodge any questions surrounding her walk off the 'Today' set over dressing room conditions. Seems like she's not going to spill the beans anytime soon!

Justin Timberlake revealed to social media that he has caught the flu, and as a result, had to cancel his upcoming London concert.

Plus, Travis Kelce attended Taylor Swift's first Sydney concert, and she planted a kiss on him following the show.

Subscribe to The TMZ Podcast wherever you get your podcasts!

Travis Kelce was front and center for his girlfriend, Taylor Swift, as she took the stage down under anew ... and she showed her appreciation for him afterward with a little sugar.

The Kansas City Chiefs tight end was among thousands of people in attendance Friday at Accor Stadium in Sydney -- where T-Swift kicked off a fresh round of performances heading into the weekend. Just like at other shows of hers he's been to ... the fans went wild.

Lots of videos are floating around on X that show TK making his way to his spot in the stadium -- and as he passed a bunch of Swifties ... they were losing their s*** screaming.

Travis soaked up all the attention ... clapping and waving at all the young'ns as he passed them -- with security flanking him on all sides, of course. He had a buddy with him too -- Ross Travis -- who's a former Chiefs player ... and who's randomly accompanying Travis on this Aussie trip. Taylor's dad, Scott, was also in the mix as Trav went to his VIP tent.

BTW ... there were other famous people at this show -- namely, Katy Perry and Rita Ora ... and Travis snapped a photo with the latter. Indeed, he's got his friendship bracelet on! After the concert, he was there to greet Taylor -- and lingering fans saw her plant one on him.

As Travis and co. looked on ... Taylor was onstage doing her thing, and put on a helluva show like she normally does. Lots of highlights from that -- all captured in photos, no less.

When it comes to Travis -- the dude is obviously committed to the relationship -- he's already traveled internationally for Taylor before this ... and he did it again here in Australia. He hasn't missed a beat either with Taylor since arriving -- going from plane to zoo date ASAP.

It's no small feat. As we reported ... Travis' long trip to see Taylor again began Tuesday night when he jumped on a private plane from L.A. after having dinner at Nobu Malibu.

He first jetted off to Hawaii for a short stay and then flew to Sydney, where he was pictured walking off the aircraft and climbing inside an SUV. A long trip, no doubt -- and yet ... he powered through and went right to the Sydney Zoo with his gal, playing a good sport.

This marks the 2nd time Trav has traveled around the world for Taylor ... but don't worry, she's done the same for him. Remember, she flew from Tokyo to catch the Super Bowl in Vegas -- and was there on the sidelines cheering for him as he and the Chiefs won it all.

Some wondered if they'd be able to keep the momentum going post-football season -- and so far, it appears they have ... you don't just jet off to Australia if you're half in on a relationship.

We know Trav will be there through the weekend ... but the question is, will he be her roadie through the rest of the tour? She's got shows in Singapore next as the "Eras" tour rolls on.

Katy Perry's old feud with Taylor Swift is dunzo -- something we already knew, but which was double confirmed by the fact KP crashed her Aussie show ... and sang a certain song.

The pop star was one of a handful of famous people on hand Friday for T-Swift's first Sydney concert -- where she was hanging in the VIP tent with Rita Ora and, of course, Travis Kelce ... who flew on down to be with his girlfriend.

Katy's presence was interesting though ... on account that she and Tay Tay used to beef.

That's why her singing "Bad Blood" -- which has always been rumored to be about Katy -- was fascinating to see ... as Taylor belted out the tune onstage, she was being recorded singing along down in the crowd. It's the ultimate irony ... and proof they're all good now.

Katy even posted a picture with Taylor after the show ... and they look very chummy.

If you're unfamiliar ... the whole saga dates back to 2014 or so, when Taylor was first releasing "Bad Blood" -- during which she alluded to a rift in a friendship ... and most everyone assumed she was referring to Katy, explaining it was a personnel issue.

Taylor talked about it at the time without naming KP ... "She did something so horrible. I was like, ‘Oh, we’re just straight-up enemies.’ And it wasn’t even about a guy! It had to do with business. She basically tried to sabotage an entire arena tour."

TS added ... "She tried to hire a bunch of people out from under me. And I’m surprisingly non-confrontational – you would not believe how much I hate conflict. So now I have to avoid her. It’s awkward, and I don’t like it."

Katy ended up responding with her own diss track, of sorts, and went on to say that their feud was all about backup dancers -- namely, Katy hiring some of Taylor's own staffers.

In the end ... they ended up making up by the time Taylor dropped her song/video for 'You Need to Calm Down' -- in which Katy made a cameo ... and was clearly cool with her again.

Now, they're buddies, it seems, and all that bad blood has turned into water under a bridge.

Speaking of water ... there was a lot of it at Taylor's Sydney show -- albeit, well before curtain call. Some fans got caught in a brief downpour as they were filing into the stadium