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Katy Perry hit the stage for a surprise performance at a star-studded NYC event on Thursday night ... and she pretty much blew the roof off the place.

The singing sensation was all glammed up in a ruffled cream gown and bejeweled heels as she arrived to celebrate the reopening of the Tiffany and Co. flagship store in Manhattan.

Katy was followed inside the iconic Fifth Avenue building by a bevy of bold-faced names. Among them were Hailey Bieber, Blake Lively, Florence Pugh, Zoe Kravitz, Tiffany Haddish, Mark Wahlberg, Gayle King, Pharrell Williams, Gabrielle Union and her hubby Dwyane Wade.

Everyone was having a great time, chatting and mingling around ... but the real fun started once Katy changed into a sheer gray dress and took the stage for her unexpected show. We're told Katy played 4 songs, including "Firework," "Dark Horse" and "Teenage Dream."

Check out video, obtained by TMZ, showing Katy belting out "Dark Horse" while doing a sexy dance knee-deep in a dense fog from smoke machines. As you can hear, the crowd ate it all up, begging Katy for more.

After Katy was done dazzling on stage, she posed for some selfies with fans.

Ariana Madix is singing her way through any lingering breakup blues she might have -- letting her hair down to belt out some karaoke overseas, and her song choice is an interesting one!!!

The "Vanderpump Rules" star was at The Banshee Labyrinth early Wednesday morning in Edinburgh, Scotland ... and witnesses tell us she was having a good ol' time, even before grabbing the mic.

Ariana got up and sang "Hand in My Pocket" by Alanis Morissette ... which, of course, is all about staying afloat and looking at the bright side in the midst of pain. Sounds familiar.

You can see she really got into the performance, putting a little extra on the line, "Everything's gonna be fine, fine, fine" ... and, at one point, high-fiving a woman in the crowd.

We're told she was there with 2 unknown pals, male and female, and everyone was in a great mood as they chatted before Ariana put on a show.

The generous, and/or drunk, patrons ate it up and showered her with applause.

As you know, she's been going through it since finding out her ex-boyfriend Tom Sandoval was cheating with their costar, Raquel Leviss ... putting an end to their 9-year relationship.

Of course, AM has seemingly moved on with her Coachella bae, Daniel Wai -- and now, she's sending a "fine, fine, fine" message.

The Crazy Town boys are living up to their band name -- 2 of the members got into a good old-fashioned fistfight after a show this weekend ... and it was ugly.

TMZ has obtained video of the throwdown that unfolded Sunday in Myrtle Beach, SC -- where CT was performing ... only to have their lead singer, Shifty Shellshock, not show up 'til the very end. Co-vocalist Bobby Reeves had to fill in ... making for a very rocky show.

There's video circulating of Reeves attempting to handle frontman duties -- at times, forgetting lyrics to songs -- while publicly expressing his frustration with Shifty for bailing.

Eventually, Shifty did show up and another clip that's made the rounds shows him and Reeves in a heated argument by an SUV -- with BR rocking a fresh black eye. Now, we know how he got that shiner ... they were trading haymakers after the Myrtle Beach gig.

In our video, you can see Shifty wailing on Bobby ... and they're arguing about money SS believes Bobby stole. Bobby denies that, and goes on to make some pretty vile threats against Shifty's family members ... including his kids.

Eventually, Bobby sneaks in a sucker punch and they go at it again -- only to finally be pulled apart by others. Sources close to the band tell TMZ this brouhaha went down as soon as they got off stage, but in the aftermath, they've supposedly settled things.

We're told it was a "fight between brothers." Unfortunately, this is just the latest mishap in Crazy Town -- one night prior, Shifty got into it with a sound guy during a show in North Carolina. FWIW, the guy's publicly battled addiction for years.

We'll see how long the band peace treaty lasts.

Harry Belafonte, the iconic and pioneering singer, actor and civil rights activist is dead ... according to his rep.

Ken Sunshine says Harry -- who burst onto music charts in the 1950s before becoming a successful actor -- died Tuesday at his home in Manhattan of congestive heart failure.

Belafonte popularized calypso music in America in the early 50s with his infectious -- still, to this day -- hit song, "Banana Boat Song" ... also known as "Day-O." Younger folks will recognize it as that song from "Beetlejuice."

Harry was born in NYC to Jamaican-born parents, so his music was fueled by Caribbean sounds ... and his breakthrough album, "Calypso" became the first ever record to sell more than 1 million copies in a single year.

His music success made him in a commodity in Hollywood where he immediately landed roles in "Carmen Jones," "Island in the Sun" and "Odds Against Tomorrow." He was also very good friends with Sidney Poitier, with whom he costarred in the 70s classics, "Uptown Saturday Night" and "Buck and the Preacher."

As prominent as he was as an entertainer, Belafonte is equally hailed for his work as a civil rights leader and human rights activist. He was commonly seen marching with Dr. Martin Luther King Jr. in the 60s ... and he was at the forefront of efforts to fight famine in Africa.

He was one of the key organizers of the "We Are the World" charity record in 1985. In fact, Harry was so respected among the packed room of superstars that during the late night recording, they all spontaneously burst into a few verses of "Day-O." Very cool moment.

Just last December -- the last time he attended a public event -- he received the National Order of the Legion of Honour from the French government.

He's survived by his wife Pamela, 4 children -- including actress, Shari Belafonte -- 2 stepchildren and several grandchildren.

Harry Belafonte was 96.

Taylor Swift fans are rallying for one of their own, flocking to a GoFundMe page set up for a fellow Swiftie who was killed by a drunk driver after her Houston concert ... and it's garnering a ton of cash in just over 24 hours.

20-year-old Jacob Lewis and his sister April were leaving Taylor's Eras Tour concert early Saturday morning when their car broke down on a highway. As Jacob got out to push the vehicle, he was struck by 34-year-old Alan Bryant Hayes.

Jacob died at the scene, and a GoFundMe was started to help his family cover funeral expenses ... and it blew past the $60K goal in a little over a day -- with Swifties seemingly providing a good portion of that total.

Many TS fans chose to donate $13 each -- Taylor's lucky number. A lot of the comments on the fundraiser are references to the singer's music, too ... like "Hold on to the memories, they will hold on to you… Long live, Jacob."

Backstreet Boys singer AJ McLean says he's using the separation from his wife to work on his own demons and become a better version of himself ... hoping they'll come back stronger than ever.

We caught up with AJ at LAX Monday and he got super candid on why he and his wife, Rochelle DeAnna McLean, decided to hit the pause button on their marriage.

AJ says he talks to Rochelle and the kids multiple times every day, especially when he's on the road ... and that'll never change.

TMZ broke the story ... AJ and Rochelle, who share 2 kids together, decided to temporarily separate ... telling us they wanted to work on themselves and their marriage.

AJ says he's fully committed to his 12-step program and is sober as can be ... something that's clearly essential to him in moving forward.

The people who organize Coachella figured out how to work with those late night noise rules -- 'cause the fines they're paying for running long are about half of last week's.

A rep for the City of Indio tells TMZ ... Goldenvoice was fined $51,000 for curfew violations racked up during Weekend 2. That might sound like a lot, but pales in comparison to the $117k they shelled out last week for the lengthy final sets that crept into the wee hours of the morning.

Here's the breakdown ... we're told Friday night's festivities went 2 minutes past the 1 AM curfew -- amounting to a $20,000 fine. Saturday, which also had a 1 AM curfew in place, didn't go over the line at all ... so no ding there. Sunday, however, went well past the slightly earlier 12 AM curfew ... at 16 minutes, and costing Goldenvoice $31k.

You'll recall -- the contract festival organizers have with the City calls for a daily fine of $20k for the first 5 minutes past curfew, with another $1,000 added for every minute thereafter.

Like we said ... $51k is nothing to sneeze at, but considering they got the fines down a significant amount compared to Weekend 1 ($66,000 in savings) -- it's not half bad.

The lineup changed a bit this week ... including the notable replacement of Frank Ocean, who had to bow out after injuring himself. Blink-182 stepped in to handle main stage duties at 9:20 PM, and then Skrillex and other EDM DJs filled the void later at 10:25 PM.

Taylor Swift fans can breathe a sigh of relief after learning their favorite singer is gonna be A-OK after getting a nasty gash on her hand during her Eras tour.

Taylor broke it down on social media Monday, taking 100% of the blame for the injury, saying she tripped on her dress at one of her Houston shows and "fell in the dark backstage while running to a quick change."

She says she braced her fall with her palm -- sort of a blessing and a curse. She goes on to mention she's all good, though ... and thanks Houston again for "3 insane shows."

For those unaware, fans started sharing concerns online after a TikTok went viral Sunday, where she appears to have a chunk out of her hand while performing. The whole thing was wrapped up in medical tape later on in the show.

Many were confused as to how she could end up with the "chunk" missing -- others called her a serious trooper for not canceling the show amid the apparent crisis.

As you know, Taylor's been rocking the stage nonstop during her Eras tour ... starting last month and pushing straight through the summer. She's scheduled for 3 nights in ATL this weekend.

Morgan Wallen fans in Mississippi aren't waking up singing his songs, or his praises ... because he pulled the plug on a concert just minutes before he was set to get onstage.

The country singer was about to jump into night 2 of his shows Sunday night at the University of Mississippi and the crowd was ready to hear some hits before screens around the stadium displayed the last thing they wanted to see.

The message told concert-goers that Morgan's voice was shot and he wouldn't be able to perform, adding they'd get refunded ... but that didn't seem to help, because people obviously were still pissed -- sharing some outrage on social media after they were left high and dry.

Morgan took to Instagram after the last-minute cancelation ... telling fans he spent the day resting up after his voice started to go -- adding "I really thought I'd be able to take the stage and it kills me to deliver this so close to showtime."

That didn't seem to make much difference to upset fans, especially some young kids in the crowd who left in tears.

As we reported, Morgan had some more trouble at his Louisville show Thursday ... taking a hard fall after all the fog onstage made it practically impossible to see where to step. Some people in the audience also said there were technical issues during that show, too.

Clearly, some bad juju surrounding Morgan's concerts in the last week. Maybe a reset's exactly what the doctor ordered!

Meghan Trainor is walking back her comments and issuing an apology ... this, after coming under fire for saying 'f teachers' on her podcast.

The "Mother" singer issued an apology to her fans Sunday via TikTok ... saying "I was fired up because we were talking about how sending your kids to school here in America is so horrific."

She went on to say her frustration came from her own experience, back in the day, and was fueled by her knowledge of other folks' past trauma in the classroom. She continued, "I was bullied by some teachers so in that moment I got angry and said 'f teachers.'"

ICYMI, Meghan made the comment on her 'Workin' On It' podcast during an episode on motherhood. Toward the end of the show, her brother/cohost and their guest Trisha Paytas got on topic of schools ... both MT and TP said they planned to homeschool their kids and Meghan got really candid about her feelings about teachers.

Of course, her words were met with backlash with lots of folks running to the comment section. One user wrote, "We can all agree that the education system is broken and needs reform; however, us teachers, deserve respect and the absolute bare minimum."

Khalid is not a fan of AI infiltrating the music world ... and while he thinks the tech could be a helpful tool, he draws the line when it comes to mimicking artists.

The R&B hitmaker gave us his 2 cents on AI and the future of his industry, especially now that new AI-generated songs are popping up on the Internet almost daily.

Khalid says AI programming, in general, seems to be inevitable, but he made it clear he's not necessarily hopping on that train. On one hand, he understands how AI software can be a beneficial tool, but he's more concerned it could eliminate the need for human performers, like himself!

As you know, Drake has been experiencing this firsthand. You'll recall, some AI-generated Drizzy tunes -- meaning computer-produced vocals -- went viral and sounded just like Champagne Papi IRL.

And, this happened shortly after an AI song featuring Drake and The Weeknd became an internet sensation ... until Universal Music Group got it removed from music streamers.

Of course, Drake's label and other big artists have made it clear they aren't here for the humanless music, and Khalid agrees. He says he appreciates music as it is, and AI takes away the authenticity of artists.

Coachella is entering its final day, until the festival's return to the desert next year, and Saturday night delivered some of the biggest acts in music and some fun surprises, too.

BLACKPINK took the main stage once again as headliner, putting together a show with plenty of special effects while all 4 members looked and sounded incredible.

Earlier on in the day, Rosalía was also on the main stage, her performance has been one of the festival's most talked about for all the right reasons ... and she didn't disappoint with round 2.

Kid Laroi, Labrinth -- with special guest Zendaya -- and 070 Shake were just some of the tons of other artists to grace the festival's various other stages.

Fans also went wild when Sia joined Labrinth for their song "Thunderclouds."

Frank Ocean's Coachella performance was originally set to feature an ice rink ... and while those plans were ultimately scrapped, TMZ has the first look at what could have been.

We obtained photos and videos of Frank's ice rink, which was set up about 50 yards from the main stage before he pulled the plug on the elaborate performance.

The images are from ice rink rehearsals on the Tuesday before Coachella Weekend 1 ... and folks who were there say security around the rink was very tight, with Frank not wanting anything about the frozen set to be spoiled beforehand.

It looks pretty cool ... and it may turn out to be one of the biggest "what ifs" in Coachella history ... because the ice rink didn't get worked into Frank's Sunday headlining set.

TMZ broke the story ... Frank hurt his ankle on festival grounds leading up to his show, causing some last-minute set changes, including putting the ice rink on ice.

Sources close to production tell TMZ ... ice skaters who had rehearsed for Frank's performance found out 3 hours before he was set to take the stage Sunday the rink plans were being scrapped.

Frank ended up performing without the ice rink, showing up an hour late and delivering what many festivalgoers felt was a lackluster performance.

TMZ broke the story ... Frank dropped out as a Weekend 2 headliner Wednesday, citing a fractured leg and sprained ankle.

We're told the ice skaters got an email Thursday informing them they would not be performing Weekend 2. They will only be paid for a month's worth of rehearsals, plus the Weekend 1 rehearsal and performance.

It's interesting ... sources say Frank was super nice, hands on and amazing to work with during the first half of the monthlong rehearsals leading up to Coachella, but about halfway through everything changed and Frank became very reserved and would just sit in the corner and not interact with the performers.

Kim Kardashian got some very special treatment from Usher ... not only did she have one of the best seats in the house for his residency -- she got an up close and personal performance, too!

Kim hit the Park MGM Hotel Saturday night to see Usher's "My Way" Vegas show ... a residency that's been hugely successful for months now.

Of course, Usher sang some of his biggest hits, including "Burn," "You Remind Me" and others ... but he also came right up to Kim's seats to serenade her as she watched with hairdresser pal Chris Appleton -- who brought along his fiancé, actor Lukas Gage.

Zendaya is the star of one of the biggest shows on TV ... and she became the star of one of the biggest music festivals in the world when she made a surprise appearance during Labrinth's set.

Labrinth -- who has written, sings and produced a bunch of the songs featured on HBO's "Euphoria" -- took to the stage Saturday during Coachella's second weekend.

Fans went absolutely insane when unexpectedly, Zendaya joined Labrinth onstage to perform "All For Us" ... a song the two have together. It's the first time Zendaya's performed in years, and she didn't pop up during Weekend 1 of Coachella ... so the show was extra special.

We should note -- "All For Us" is a song featured on "Euphoria" -- and in 2020 Labrinth won an Emmy for Outstanding Music & Lyrics for the tune ... so it's super popular.

Zendaya marks the second surprise guest for Labrinth in as many weeks ... he brought out Billie Eilish last weekend ... much to the delight of fans.

Bob Dylan's harmonica, which he played during his legendary Town Hall performance, is now up for grabs ... thanks to Peter McKenzie, who was gifted the unique piece of history.

The folks at Moments In Time are selling one of the harmonicas Bob played during his 1963 concert at Town Hall in NYC, and it's going for a nice chunk of change -- $45K!

The performance was the first big concert of Dylan's career. The venue sat 1,500 fans, and it helped launch his illustrious career.

The instrument was one of two harmonicas gifted to Peter, days after Dylan's performance as he visited the McKenzie family home. BD even wrote the title of the song he played on the front of the box.

Peter talks all about the day he was bestowed the special gift in his book "BOB DYLAN On A Couch & Fifty Cents A Day" and now he's sharing it with a lucky buyer ... with deep pockets, of course.