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Vin Diesel felt the urge to dance ... by himself ... to a Katy Perry song ... and thankfully, he recorded the entire session on video to share with the world.

Diesel took a break in the middle of rockin' out to explain why he felt like dancing -- "Universal just called me and told me "Riddick" is number one on the DVD charts."

Vin says he's especially stoked because it was such a challenge to get the movie made in the first place -- so to celebrate, he cranked some KP (and later Beyonce) and let himself go.

The 33-couple wedding during Macklemore and Ryan Lewis' performance at the Grammys was the feel good moment of the night ... except for one man -- who did everything he could to stop the love of his life from tying the knot.

Michael Politz tells TMZ ... he learned Sunday his ex-girlfriend Tammy (pictured below last night) would be saying "I Do" to her new dude during the "Same Love" performance ... and went into a panic trying to shut it down.

Michael says he called everyone under the sun who might be attending the awards ... so they could tell Tammy how he felt -- including Vince Neil -- but none could make it happen.

"I'm heartbroken" Michael says. Adding, "I don't know if I'll ever trust again."

Newlywed Tammy Grabel tells TMZ ... "Michael is a broken hearted ex-boyfriend. Seth and I are very happy to be married ... I had no idea Michael was trying to stop our wedding."

Guessing he assumed it would end like this.

Honey Boo Boo is mysteriously bailing on public appearances ... and we know the reason -- a smashed Pumpkin.

Boo Boo was a no-show this morning on "GMA" and we're told she won't show up at Katie Couric's show either.

Turns out the kid's family ties are more important than mugging for a camera. She's been spending time in the hospital with big sis Pumpkin, who was badly hurt in the family car accident last week. Pumpkin suffered severe chest bruises, a concussion and weakness in her legs.

She can be annoying, but she's a good sister.

"Burn Notice" star Seth Peterson proudly plastered his new 22-year-old girlfriend all over the Internet -- which normally would be fine ... except he's still got a wife ... who's about to give birth.

TMZ broke the story ... Peterson's wife Kylee Cochran just filed for divorce, claiming her 43-year-old husband bailed on their 12-year marriage in September (when she was just 3 months pregnant with their 3rd kid) to shack up with Miranda Doerfler, a 22-year-old aspiring writer.

Miranda has since posted photos of herself with Peterson all over Facebook, writing captions like, "Okay. Officially. Seth Peterson and I are a couple."

One of Miranda's friends commented, "I thought he was married." And Miranda responded, "Lol, yeah" ... meaning, he WAS. Rhymes with witch.

Will Smith has finally opened up about the death of his TV dad James Avery ... saying the guy who played Uncle Phil on "Fresh Prince" made him a more "respectable human being."

Smith just posted a tribute to his co-star on Facebook ... writing, "Some of my greatest lessons in Acting, Living and being a respectable human being came through James Avery."

He added, "Every young man needs an Uncle Phil. Rest in Peace."

Smith also included a photo with Avery and other "Prince" cast members taken the last time they all got together.

We broke the story ... Avery died Dec. 31 after experiencing complications from open heart surgery. He was 68.

Robin Roberts just officially came out of the closet ... telling the world she's gay and has a longtime girlfriend.

Robin just recounted her triumphs over the last year on her Facebook page ... talking about her battle with cancer and how she overcame the odds and regained her health.

In the middle of her Facebook essay she said, "I am grateful for my entire family, my long time girlfriend, Amber, and friends as we prepare to celebrate a glorious new year together."

It's kind of cool the way she did it, she didn't scream it from the mountain tops ... but she revealed her true self in an authentic way.

Good for Robin.

Barron Hilton has launched a full-frontal attack on the guy who beat him to a pulp in Miami last week ... and one thing's clear -- his 7th grade English teacher is hanging from the light fixture in her bathroom.

Barron posted his version of events on his Facebook page, scoffing at allegations he threw his famous last name around. Barron says, "This is as ludicrous, and almost as embarrassing as being publicly associated to (SIC -- sorry Barron, it's with) Lindsay Lohan."

Barron does admit, "I am guilty of being at the wrong place at the wrong time, nobody should ever put their hands on someone else." (Blatant run-on)

He continues by attacking puncher Ray Lemoine, "Lemoine sucker punched me, ran away, and used his blog to conjure up an image of himself as a hero by publishing lies." Suggestion -- period after hero -- confusing.

Barron says he wrote what he wrote because he was compelled to "articulate the truth."

Paul Walker's daughter does NOT have a public social media page ... and his reps have already shut down one site run by an impostor.

Multiple news outlets posted stories Sunday morning saying Paul's 15-year-old Meadow Walker -- pictured above with her dad back in June -- paid tribute the actor on her Facebook page after the crash ... only problem, it's run by a fake.

Aaron Carter filed bankruptcy docs claiming his dog was worthless out of fear the judge would take the pooch away.

As we reported ... in Aaron's list of assets, he included his pure-bred English bulldog King ... assessing its value at ZERO.

Aaron is telling his buds ... he devalued the dog because he was worried the bankruptcy trustee would sell King to pay off his creditors ... to whom he owes more than $2 million.

In case you're wondering ... these dogs generally go for upwards of $1,500.

Meet the woman Pauly D knocked up on the first try.

Amanda Markert -- a Hooters' alum who worked as a VIP hostess when she and Pauly got wasted in Vegas and had unprotected sex -- is what you expected to see. Check out the photos.

It's not all sunshine for Amanda. She's now the mother of 2 who is waging legal war with Pauly over custody of 5-month-old Amabella.

The man who raised Adrian Peterson's 2-year-old son says he's sick and tired of people feeling sorry for the NFL star, claiming AP didn't care about the boy because he never got the chance to meet him.

We broke the story, AP only learned he was the biological dad a few months ago. Before the revelation, the child's mother was under the impression that the father was a man named Bobby Ruffin.

After the child passed away on Friday, Bobby went to his Facebook page and unloaded ... writing, "So tired of this poor Adrian Peterson sh*t. Let me blow all your minds. The boy who died was my son."

"Yes A.P. he was the biological father but I raised him and he carried my name. Tyrese Robert Ruffin. I don’t blame AP for not really caring cuz him and I both found out recently who the biological father was."

“AP met my son for the first time yest when my son was already in coma. I was here today when we pulled the plug, not him. He was happily practicing and has no problem playing on Sunday."

Head joins Hollywood's elite celebrity face-tattoo club -- alongside people like Mike Tyson, Gucci Mane, Lil Wayne and the Game.

Billy the Blind Kid from "Dumb and Dumber" better kiss Mark Zuckerberg's tuchus -- 'cause he'd have been screwed out of the sequel if it weren't for Facebook.

Billy -- real name Brady Bluhm -- was praying he'd get a call for part two once the studio confirmed it was a go ... but weeks passed without a peep.

Turns out the Farrelly Brothers had written his short, yet memorable part into the new script ... but didn't know if he was still in the business and couldn't find him.

Thankfully for Brady ... it's 2013 and they found him through FB. But business is business .. he still had to audition for the gig. He passed!

Brady says Harry and Lloyd still live in the same apartment for 'To' ... but beyond that he was tight lipped.

Mark Zuckerberg's ginormous wealth can be traced back to 2 facts: 1) He spends next to nothing on clothes ... and 2) He has major rich guy swag in his stride.

Yeah. Facebook might have a little to do with it too -- but don't undersell dude's wardrobe and walk.

Someone's been sleeping in Jennifer Lopez's pool house, and it ain't Goldilocks -- cops arrested an alleged stalker who somehow managed to live in the pool house of her massive Hamptons mansion ... for several days ... without getting noticed.

According to Southampton police, 49-year-old John M. Dubis basically moved in to J.Lo's $10 million pad sometime in early August.

He reportedly walked around the estate freely, hanging out openly in view of neighbors... and even posted Facebook photos of himself all over the grounds, such as the one below -- before police finally busted him on Aug. 8.

And how's this for weird ... two days before his arrest, Dubis dropped by a nearby menswear store and purchased a plaid overcoat.

Jennifer was not home, but the shocking part is security guards were patrolling the property.

Of course, you have to remember the 8,500 sq. foot home sits on 3 acres -- and it's a decent hike out to the pool house from the main quarters.

Dubis was booked for burglary, stalking, and criminal contempt. He pled not guilty, and is currently sitting in jail in lieu of $100,000 bail. The judge has ordered a mental evaluation for Dubis.

Things got real cheeky between NYC mayor hopeful Anthony Weiner and his latest sexting partner -- TMZ has obtained a pic she sent to him on Facebook ... showing off her ass in a thong ... and that's just the beginning.

23-year-old Sydney Elaine Leathers tells TMZ she sent the photo to Weiner in July 2012, modeling a cheeky-cut lace thong (good choice) ... in what appears to be her bathroom (bad choice).

Weiner admitted yesterday he sexted long after he resigned from Congress in 2011, but finally nipped his sexting problem in the bud last summer ... around when Leathers sent the thong photo.

Leathers says ... Weiner was very persistent in his naughty picture requests, asking her to send all sorts of naked photos ... more than 30 in total. But we're told Weiner also has a foot fetish, and regularly asked for pics of Leathers' feet in heels. Of course, this was all allegedly in exchange for pictures of his own naked ... weiner.

And the relationship wasn't just online either, we're told Weiner regularly spoke to Leathers on the phone -- in fact, Weiner was adamant about speaking to her because he enjoyed telling her about his sex dreams ... most of which involved her. Shower sex was allegedly one of his favorite topics ... his wife, Huma, was not.

As we reported, Weiner now claims the entire sexting debacle "is entirely behind me," and that he's moving full steam ahead with his mayoral campaign. Good luck with that.