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Nick Cannon was in the house to see his ex-wife Mariah Carey leave her mark on Rihanna's breast ... and he says more women should follow their lead.

We got Nick heading in to do some charity work Friday at the Los Angeles Mission and our photog asked him about the viral video from Mariah's recent concert.

Nick says watching Mariah autograph RiRi's boob was "hot" ... and he hopes it becomes a trend.

Britney Spears has a new bed companion ... no, not a model with rock-hard abs -- it's actually a stuffed rabbit she brought back from Mexico.

The singer-songwriter left Cabo, Mexico to get back to Los Angeles Thursday -- bringing her new furry friend back from south of the border.

She's holding her new pal tight in Mexico -- covering up most of her face with it while adding a black hat and dark sunglasses to her look.

Rihanna’s dropping a holiday snack hack for all the soccer moms -- a snack that's both bougie and budget-friendly... depending on who’s paying!

The Fenty Beauty entrepreneur dropped a hilarious IG video Thursday ... where she flexed with her caviar while her friend brought a plate of chicken nuggets to the table, creating the ultimate "chicken nugget caviar" combo.

The video is pure gold -- just two pals having a blast, with RiRi spreading her luxurious caviar on her friend's budget-friendly chicken nuggets like it’s no big deal.

Paul McCartney and Ringo Starr are getting back to where they once belonged ... onstage together in the UK!!!

The Beatles stars made their surprise reunion on Thursday night at the O2 Arena in London, all apart of McCartney's "Got Back" tour, which has gone across Europe and Latin America.

McCartney introduced his former bandmate as, "The one and only Mr. Ringo Starr!" Needless to say, the crowd went absolutely wild.

Britney Spears took her dancing to new heights, going harder than ever in one of her most intense performances yet -- so wild, you might need a second pair of eyes to keep up!

In an IG clip shared Wednesday, the bikini-clad singer treated fans to a high-energy mix of her signature moves -- butt slaps, thumbs in her underwear, chaotically strutting up to the camera, and twirling so fiercely she nearly loses her balance.

Her routine, filmed during her Mexican getaway, also introduced us to some fresh moves -- think unique hand shapes, a surprise stuffed animal cameo, and, of course, some intense body contortions.

Kim Kardashian isn’t letting a broken foot cramp her style -- she scooted right into the Billie Eilish concert, still living her best life!

The SKIMS mogul was all about good vibes Tuesday night -- laughing, flipping her hair, and serving looks as she scooted into Eilish’s night 3 at L.A.’s Kia Forum.

Kim turned heads in a white top, leather pants, and a stack of jewelry, oozing effortless glam. But her best accessory? That scooter, of course -- 'cause only she could make that look cool.

Billie Eilish brought the house down on night two of her L.A. tour, reminding everyone why she’s still one of the reigning queens of the music scene!

The likes of Kourtney Kardashian, Gal Gadot, "Weird Al" Yankovic, Josh Brolin, and Tana Mongeau turned the Kia Forum into a celeb magnet Monday night ... as they were spotted strutting out of the singer's electrifying show.

Clearly celebs and fans alike couldn't get enough as Billie lit up the stage with her signature bangers, quirky vibes, and a fashion game only she can pull off!

Justin Timberlake's bringing micro back -- well, that's what his fans are saying after getting an unexpected eyeful during his wardrobe malfunction!

A viral clip from Justin’s recent Nashville gig shows his super tight harness stealing the show -- thanks to its triangle-style straps that accidentally spotlighted his groin area.

JT didn’t look down as seen in the fan-captured TikTok ... but he definitely felt the rise in attention and tried to cover up the bulge, tugging at his shirt to keep the area under wraps.

Liam Payne's fatal fall was witnessed by a hotel guest who was at the CasaSur Palermo in Buenos Aires for his wedding, and he is haunted by what he saw.

Bret Watson was in a room on the first floor of the hotel with his wedding planner, and as they looked out the window they saw Liam in free fall. Bret appears in our new documentary, "TMZ Presents: Liam Payne: Who's to Blame?" airing on FOX tonight at 8 PM ET and streaming on Hulu beginning Tuesday.

Bret and the wedding planner ran to the balcony and looked down ... and immediately identified Liam, who he believes died instantly.

Bret says the sound of Liam's body hitting the ground was even more haunting than the fall itself, and it's apparent from the interview he's still having pretty severe emotional difficulty.

A waiter prosecutors want to charge in connection with Liam Payne's death admits he used cocaine with the singer ... but insists he didn’t get paid and is NOT a drug dealer.

Braian Paiz told us in our upcoming documentary "TMZ Investigates: Liam Payne: Who's to Blame?" -- airing Monday night at 8 PM ET on FOX — he partied with Liam in the singer’s Buenos Aires Hotel room.

Paiz says they drank whiskey and used the cocaine he brought to the hotel. He says they did it on 2 occasions … the second just 2 days before Liam’s fatal fall from the hotel balcony.

Ariana Grande's clearly having a "Wicked" good time acting and making music ... but, touring is falling by the wayside -- 'cause she won't be doing a circuit in 2025.

Here's the deal ... rumors about the singer-songwriter going on tour next year began to pop up online because fans say there were apparently Ticketmaster listings about an upcoming string of shows.

It's unclear why these appeared on their website ... but, Ari's label -- Republic Records -- quickly put the rumors to rest, commenting on a post that she's got no plans to go on tour.

James Kennedy deejayed to a packed crowd in Milwaukee over the weekend ... just days after he was arrested on charges of domestic violence.

New video obtained by TMZ shows the "Vanderpump Rules" alum on stage at The Rave Eagles Club Saturday ... with fans showing up in droves, seemingly unfazed by James' arrest.

Check out the clip ... the crowd's dancing along as JK spun a high-energy set -- with James having the time of his life and grooving onstage.

Luigi Mangione could be "the one" for a whole lotta people, it seems ... 'cause his photos drove a concert crowd into a frenzy -- all while a popular Miley Cyrus song played.

Here's the deal ... Bop to the Top Tour's Jingle Bop -- a concert series where DJs play popular Disney Channel hits -- stopped in Boston Friday night, and one disc jockey decided to combine current events with a classic track.

Watch the clip ... Cyrus' song "He Could Be The One" -- recorded during her "Hannah Montana" days -- blares over the speakers while pictures of Mangione start to populate the screen.

Liam Payne's close friend, now in the crosshairs of Argentinian authorities -- insists when he left the singer at the CasaSur Palermo Hotel an hour before his death, he seemed fine ... But authorities and eyewitnesses say that's anything but true.

Roger Nores appears in our new documentary, "TMZ Investigates: Liam Payne: Who's to Blame?" -- which airs Monday night at 8 PM ET on FOX -- says he was with Liam on and off the day he fell from the hotel balcony to his death.

Nores says, he checked on Liam three times during the day, and when he left an hour before the fatal fall Liam seemed happy and fine, although a little tipsy.

Billie Eilish didn't want to be the "bad guy" at her concert ... continuing to sing one of her hit songs after taking a bracelet to the face.

The singer-songwriter was performing in Glendale, Arizona Friday night as part of her "Hit Me Hard and Soft" world tour ... when she sat at the front of the stage -- belting out her Oscar-winning track, "What Was I Made For?"

Watch the clip ... Billie's right in the middle of the heartfelt tune when something blue -- which appears to be a bracelet -- smacks her just below the eye, temporarily stunning her.

Madonna is at it again ... finding herself in controversy after sharing A.I.-generated images of herself and a handsy Pope Francis.

The superstar posted the pair of A.I. snaps to her Instagram Story on Friday ... which made the Pope appear to be getting a little too fresh with the diva.

Along with the A.I. images, Madonna wrote on pic ... "Going into the weekend like..." and on another noted ... "Feels Good to Be Seen......"