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Lance Bass went all out for his 46th birthday ... spending the weekend partying in Las Vegas, and getting pulled onstage by Nelly.

The NSYNC singer was at Ayu Dayclub at Resorts World on Sunday when Nelly brought him onstage for a surprise performance ... and the crowd went bananas.

TMZ obtained video of the Lance-Nelly gig ... and they performed their hit from back in the day, "Girlfriend," which was a collab between NSYNC and Nelly.

Megan Fox and Machine Gun Kelly seem to be shelving their personal chaos -- at least for now -- for their baby girl’s sake ... ’cause the two were just spotted out and about for the first time since the birth.

Peep the pics snagged by TMZ -- Megan and MGK were deep in co-parenting mode during their first public outing since their baby’s March debut, spotted grocery shopping at L.A.’s bougie fave, Erewhon, on Sunday.

MGK strolled out with a green juice in hand, looking chill as ever, before sliding into the car with Megan, who casually handed over the driving reins as they cruised off together.

Led Zeppelin's Jimmy Page isn't showing a songwriter a whole lotta love over one of the band's classic hits, and now he's dragging the guitarist into federal court.

A guy named Jake Holmes filed the suit against James Patrick Page -- yeah, that's his full name -- over "Dazed and Confused" ... the song Zeppelin dropped back in '69. In the docs, Holmes says it's already been legally established that he is the copyright holder on the track -- he and Page reached a settlement in 2011.

Holmes says he noticed something awry with the new IMAX documentary, "Becoming Led Zeppelin," which was released earlier this year -- the film credits say Page wrote 'Dazed' and Holmes only "inspired" it, but Holmes says that's patently false.

Kevin Garnett and his girlfriend were involved in a heated argument late last month, and cops were called to the scene ... but both sides are now saying things never got out of hand.

Law enforcement sources tell TMZ Sports ... Garnett's partner, Teare Candelier, dialed 911 just before 2 AM on April 27 to report she and Garnett had been involved in a domestic dispute at their Los Angeles-area residence.

We're told when officers arrived, Garnett had left ... but they nonetheless took a report. They noted Candelier did refuse medical aid after they asked if she needed it.

Brooklyn Beckham and Nicola Peltz's absence from David Beckham's 50th birthday is all due to family tension ... 'cause we've learned they tried to meet up and celebrate David privately -- but, they were rebuffed.

Sources familiar with the situation tell TMZ ... Brooklyn and Nicola flew to London last week -- for the sole purpose of celebrating David.

The two reached out to the fam ahead of the big weekend, we're told ... asking them to get together privately before the birthday festivities -- however, their request didn't go over well with the other family members.

"Love Is Blind" stars Joey Leveille and Sara Carton swear they're not dating ... but, they're not doing a great job of convincing fans -- further fanning the gossip flames with a late-night hang.

TMZ has obtained a video of Joey and Sara hanging out at Ethyl's Bar & Restaurant on NYC’s Upper East Side early Sunday morning ... drinking, chatting and hanging out with a pal.

Eyewitnesses say they didn't see any PDA between the reality stars ... but, the two did leave together at around 1:30 AM ET.

Seal and Heidi Klum's daughter turned 21 over the weekend, and it was complete with a heartfelt serenade from her famous father.

The model celebrated her milestone birthday in the early hours at Miami club, E11EVEN. Leni showed up around 1 AM in a party bus with around 20 friends.

The group sat at a VIP table, where a glowing sign bearing Leni’s name lit up and a parade of oversized alcohol bottles set the tone for the night.

Pee-wee Herman’s beloved bicycle from the 1985 cult classic "Pee-wee’s Big Adventure" has officially found a new home — and for a hefty price.

A rep for Van Eaton Galleries tells TMZ ... the screen-used stunt bike, ridden by the late Paul Reubens in the film, sold for an impressive $125K on Saturday.

The bicycle was one of only 14 created for the film. The prop was custom-made and while it's been restored slightly to make it appear closer to what it looked like in the film, we're told the surviving elements have been kept intact.

It isn't just Dana White's day job that involves people going to sleep ... it's also an occupational hazard in one of his side hustles -- bull riding!

The UFC honcho isn't saddling up on the 2,000 lb. animals (though he once did -- more on that in a minute), but he's very much involved in the sport. White owns his own bull, Playmate, which just competed in a Professional Bull Riders event last week.

"He's a bad boy," Dana told Babcock on the TMZ Sports TV show (airs nightly on FS1).

Shedeur Sanders and Travis Hunter are making waves in football, and they now have an open invite to venture into Hollywood, too ... 'cause "All American" actor Kareem Grimes, who wants the NFL rookies to guest star on his show!!

Grimes -- who portrays Preach in the hit series -- spoke with TMZ Sports after the football drama's seventh season wrapped up this week ... and he actually had three names in mind when we asked which jocks he'd love to see join the fun.

"Shedeur and Travis have been in front of cameras," Grimes said, "They have their own YouTube channel, so I'm pretty sure you put 'em in a space, they'll thrive!"

Karen Read looks to be taking her retrial for murder in stride ... appearing relaxed after a recent court appearance -- having a drink and chatting with strangers.

TMZ has obtained photos of Read at SAVR, a bistro in Boston's Seaport District -- not long after she finished up another week of her retrial on Friday.

Eyewitnesses tell us Read was with her legal team -- including powerhouse defense attorney Alan Jackson ... who we're told flattered everyone in the bar, working the room and schmoozing like a pro.

A top primatologist is trying to bring some reason into the hundred men vs one gorilla debate ... explaining the main reason why a fight like this wouldn't go down -- and arguing this paints these beautiful creatures in a bad light.

We spoke with Michael Stern -- a Harvard-trained primatologist with decades of experience studying gorillas both in captivity and in the wild in Uganda -- and, he tells us the main reason this debate is so silly is because one gorilla would look around, see it was outnumbered and take off.

Stern says this is the equivalent of asking if a unicorn could take down a dinosaur -- or if a shark with a laser beam could blow up a submarine!

Joshua Jackson and Jodie Turner-Smith are on the same page when it comes to most of their divorce terms -- but when it comes to grade school, they're still going at it in court.

According to new legal docs, obtained by TMZ, Joshua and Jodie have hammered out a divorce settlement. According to the docs, the couple used a mediator to come up with a temporary schedule to govern the 50-50 custody of their daughter, Juno.

What they can't agree on is ... where Juno's gonna go to school, and now Jodie wants the judge to force Joshua to adhere to a court order that gives her the power to pick Juno's elementary school.

Elizabeth Smart’s kidnapper Wanda Barzee may or may not be smiling after her arrest on Thursday ... but there’s no doubt she was one happy camper posing for her mugshot for Utah’s Sex Offender Registry.

TMZ has obtained the photo of Barzee from the registry -- and the convicted criminal could not have looked more jovial. Check out her big fat grin, showing off her yellow-stained teeth.

She also flashes her wild eyes and messy white hair with moles on her face and neck. The registry lists, among other things, her height, weight and 11 aliases along with details about her federal conviction for abducting Smart.

Star Jacksonville defensive end Arik Armstead is thrilled the Jaguars got two-way phenom Travis Hunter ... telling TMZ Sports he's super pumped to welcome his new teammate -- even if the Heisman winner doesn't spend much time on his side of the ball.

"I think this is rare air," Armstead -- who actually announced the big pick at the draft -- told us. "We have a player here who would have been a first-round pick as a receiver or a cornerback. And, you know, that's very unlikely that a prospect could be a first-round pick at two different positions."

So, where do you utilize a guy who is awesome on offense and defense? We asked Arik.

Football fans around the world were baffled when projected first-round pick Shedeur Sanders fell all the way to Day 3 in last weekend's NFL draft ... but former Browns great Eric Metcalf thinks it's a blessing in disguise -- telling TMZ Sports the QB can now play "carefree."

We caught up with the former Browns running back and wide receiver ... and he seems certain the former Colorado superstar's stock plummeted to No. 144 not because of his talent -- but his overwhelming confidence.

"All of the scouts, all of the teams said that he was accurate, he could throw the ball ... everything you wanted from a quarterback,” Metcalf said. "And for him to not get drafted in the first, second or third round is kinda a slap in his face and we all know what it was about."