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Move over Vince Vaughn ... DMX just opened up shop on a group of groomsmen heading to their buddy's wedding -- and the footage is AWESOME!

The groom's wedding party ran into X Saturday afternoon in their New York hotel lobby ... and after the rapper posed for some pictures they boarded their party bus -- says one of the groomsmen.

Inspired by the meeting, the group turned on some of DMX's music and egged him to hop aboard ... and that's when the magic happened.

Jay Z did NOT pull a fast one on his audience in Greensboro, N.C., Sunday night ... when he brought a 12-year-old boy up on stage who stole the show -- it was all spontaneous.

We spoke with Angela, who took her 12-year-old son Justin to the concert in Charlotte Saturday. She says Justin's dream was to "get noticed" by Hova and he was crushed when he was overlooked as he sat in the 8th row.

Angela says on the ride home they decided to give it one more try, and she bought tickets to the Greensboro concert the next day. She says she was lucky and scored front row seats.

Angela tells us nothing was set up. Justin jumped up with his sign and this time Jigga noticed.

Jay Z just gave a 12-year-old kid the chance of a lifetime ... and the kid delivered.

Jay discovered the pint-sized rapper sitting in the crowd at his "Magna Carter World Tour" concert Sunday in Greensboro, NC -- he was holding a sign that read, "Can I rap for you?"

Jigga pulled the lil' guy up on stage ... and the kid laid down a crazy interpretation of Jay Z's rap. Jay even cut him off ... just before he spewed some curse words.

Britney Spears got the lead out for tonight's big Las Vegas debut.

Brit's friends and family were there for her final dress rehearsal for the "Piece of Me" show ... and she did not disappoint.

Britney is back to her old self onstage ... her dance routines blew everyone away. Her singing ....

Zac Efron has taken a page out of Alec Baldwin's playbook ... when something bad happens, turn it into a joke and people will laugh.

That's exactly what Zac is doing -- without saying a word in a new video that makes fun of how he broke his jaw last month.

As TMZ previously reported ... Zac claims he slipped in a puddle of water at his Hollywood Hills home. His jaw broke and he gashed his face.

As you know .... Zac has been to rehab twice this year for cocaine abuse.

"Volare" -- the Italian song made famous by Dean Martin -- is the centerpiece of a nasty legal battle ... and it will determine who gets to sing it ... and where.

You know the song -- Voooo lar e oh oh oh oh ....

Part of the fight is over who controls the rights to the American version -- the music publisher or the family of the guy who co-wrote it when it was first recorded in Italy in 1958.

There's a lot at stake ... "Volare" is still a big hit -- and not just in karaoke bars. There've been at least 40 different covers -- from artists like Frank Zappa, Paul McCartney, and David Bowie.

And whoever owns the song will have the power to decide who can record it.

Macaulay Culkin's new pizza-inspired band made their concert debut last night in New York ... and the former child actor busted out a sweet kazoo solo during the 8-minute set.

Culkin's band The Pizza Underground -- who play Velvet Underground parodies with pizza-themed song titles and lyrics -- played an 8-minute set Friday night ... and fans waited around the block to get in.

Macaulay's sweet solo went down during the bands song "Take a Bite of the Wild Slice" (3:40 in the video) ... and then the group handed out pizza afterward to make up for the short gig.

The billionaire who co-founded YouTube is refusing to back down from Kim Kardashian and Kanye West -- firing back at the couple after they sued him for posting video of their engagement online.

We broke the story ... K&K filed a lawsuit against Chad Hurley, claiming he violated the confidentiality agreement he signed at AT&T Park in San Fran back in October ... when he posted the footage on his video-sharing website.

But now, Chad has filed legal docs of his own ... claiming NO ONE ever told him he wasn't allowed to shoot or distribute the footage.

Chad says ... after the proposal, someone did approach him with a waiver and told him it was a release so they could use his image in a TV special .. and he signed the doc without reading it.

He also posed for a pic with the signed form, at the request of K&K's peeps.

But still, Chad says he shouldn't be legally bound by the waiver because he was misled into signing it and he got no compensation in return for signing away his rights.

Chad is asking the judge to throw out the case -- and force Kim and Kanye to pay for his legal fees.

The Foo Fighters just had a CRAZY blowout jam session in Moorpark, CA ... at a pizza joint!

Dave Grohl and FF showed up last night -- unannounced -- at the appropriately named Redballs Rock & Roll Pizza ... surprising 200 serious eaters who paid 10 bucks apiece for the Chevy Metal Christmas Dance Party.

Chevy Metal's a band featuring Foo drummer Taylor Hawkins.

The Foo Fighters and Chevy Metal joined forces on stage for more than 2 hours ... while the audience gorged themselves into a stupor.

This is the first gig for the Fighters in months ... the rehearsals have been downright bloody. (see pic below). They're playing two gigs this week in Mexico City ... where they're Numero Uno.

Founding Grateful Dead member Phil Lesh whipped out his boomstick in Central Park today ... but don't worry he wasn't arrested ... he was just laying down some sick grooves.

Lesh pulled off the surprise gig during the NYC Jazz & Colors event in the Park ... when he randomly started performing with some friends in front of around 30 people.

The 73-year old bassist played for about 30 minutes and even jammed out on the Beatles classic "Get Back" in between impromptu jazz sessions.

The woman who videotaped a sleeping Justin Bieber in a video that exploded on YouTube is NOT a prostitute ... members of Bieber's camp who were with Justin in Brazil tell TMZ.

Ever since the video surfaced, showing an unidentified woman blowing a kiss to a passed out Bieber ... rumors began to swirl that she was a local Brazilian whore who Justin paid for.

Here's what we're told -- Justin had rented a home outside of Rio to stay at during his concert in Brazil. After his show, JB threw an after-party and invited roughly 50 people. At some point during the shindig, Justin fell asleep on a couch and one of the partygoers shot footage of the singer sleeping.

Bieber is telling friends ... he is completely creeped out by the video and is disappointed that he now has to defend himself against false hooker claims.

Here's Kate Upton ... basically naked ... with some strategically placed body paint.

You're welcome.

Kate got all painted up for a Sports Illustrated photo shoot -- in the footage, Kate's trying to recreate one of the mag's most famous Swimsuit Edition covers.

We think she nailed it.

"I definitely feel naked," Kate said during the shoot ... "Because I am."

Kate said the artists took a particularly long time to paint on the necklace on her boob area ... yeah, can't imagine why.

Justin Bieber took a water bottle to the face during a live concert in Brazil this weekend ... just like he did in 2009 ... but this time, he reacted MUCH, MUCH differently.

You remember the 2009 shot, when someone beaned the cute, adorable (shirted) pop star -- and he reacted by smiling and telling the crowd, "Ow! That didn't feel too good."

But Brazil was different -- an unshirted Bieber got smacked (while singing "Boyfriend") ... and reacts by mad-doggin' the crowd and storming off the stage.

How quickly they grow up ...

9:30 AM PT: Looks like Bieber had quite the weekend in Brazil -- during a show the next night a fan bum-rushed the stage ... and was swiftly taken care of by the backup dancers.

There are going to be MILLIONS of foxes running around this Halloween ... 'cause the furry animal costumes are selling at record numbers this year -- and it's all thanks to that insane viral video "What Does the Fox Say," TMZ has learned.

By now, you're probably one of the 131 MILLION people who watched the bizarre, hilarious (yet strangely fascinating) video by the band Ylvis on YouTube (and if you haven't seen it, GET OUT FROM YOUR FOX HOLE!).

We spoke to 3 of the biggest costume outlets in the country -- Spirit Halloween, Buycostumes, and Amazon -- and we're told that fox costumes are exploding this year, crushing last year's sales.

In fact, one outlet says fox costume sales are up almost 40% from last Halloween ... and the number is expected to rise, with Halloween still another 2 weeks away.

But don’t worry – the costume retailers tell us they’re beefing up orders of bushy tails and pointy fox ears ... so it's not too late to jump on the bandwagon and join the skulk (see below).

Fox Fact: a group of foxes is called a skulk ... now you know.

The people who bring you "Judge Judy' have just filed a lawsuit, claiming evildoers have been posting episodes of her show on YouTube ... and now she wants a non-TV judge to lay down the law.

Judy has the most popular show in daytime ... it's been that way for 3 years, since Oprah said bye bye. Here's how big -- 9 million daily viewers.

The company that produces the show -- Big Ticket Television -- gets an enormous amount of money for the show, so the idea that someone is stealing it and not paying a dime has them royally pissed off.

As for the culprit -- his name is Ignacio De Los Angeles. Ignacio dared to post an episode from 2006 on YouTube. Big Ticket told him to take it down, but Ignacio ignored.

Big Ticket wants the judge to use a can of whoopass on Ignacio, Judge Judy style.

The gloves are off in Pharrell WIlliams' trademark war with Will.i.am -- Pharrell now says Will.i.am is DREAMING if he thinks he's up to the "Get Lucky" singer's level ... because he's not even close.

As we reported, Will.i.am filed a lawsuit against Pharrell over the trademark "I Am" ... after Pharrell attempted to stake his claim on a YouTube channel called "I Am Other."

In his docs, Will.i.am suggested users might get confused over the "I Am" name because he and Pharrell have both "achieved great distinction" in the hip hop world, each releasing mega hits ... and working with the industry's top professionals.

But Pharrell has fired back ... saying that's utter BS ... Will.i.am hasn't achieved the same distinction at all. As a result, Pharrell argues there would be zero confusion about who's really behind the "I Am Other" channel.

What's more, Pharrell says Will.i.am's track record for copyright infringement is embarrassing ... saying Will.i.am's been a defendant in nearly a dozen infringement lawsuits (including song stealing).

For these reasons, Pharrell wants Will.i.am's lawsuit thrown out of court ... so he can use the phrase "I Am Other" with zero repercussions. He also wants Will.i.am to pay for his lawyers.