Hot Vegas

It all went down at the grand opening of Vanity nightclub in the Hard Rock Hotel -- which was hosted by Diddy. We're told Floyd Mayweather Jr. rolled over to the party to see Diddy, when he literally ran into rapper Rick Ross.

Sources tell TMZ one of the men "bumped" into the other man and their entourages immediately became "confrontational."

But as things started to heat up, we're told Diddy swooped in between the guys and calmed everyone down.

We called Mayweather's camp for comment and his father, Floyd Mayweather Sr., told us there's been beef between Floyd and Ross for a while because Ross has allegedly been, "talking s**t."

We're told both Mayweather Jr. and Ross eventually went back in the club and partied the rest of the night away without incident.

Kalika Moquin -- who has vehemently denied an affair with the philandering golf pro -- texted away at The Bank nightclub during a birthday party for "Twilight" star Jackson Rathbone Saturday night. We're told Kalika -- who's now working as a VIP host at the club -- was all business that night.

But Sunday, she let it all hang out -- literally -- donning a breastacular Mrs. Claus costume for "The Annual Vegas Socialite Christmas Party."

Wonder what she's getting in her stocking this year?

Lee, who plays Lloyd on the HBO show, stopped by the all-male review Saturday night at the Rio in Vegas -- and from the looks of it, it was smooth sailing for all involved.

We got this photo -- taken in October at Tao nightclub during the club's 4th anniversary party. Tiger was chatting up a cocktail waitress, but she was one of at least 10 women who were captured by Tiger's charm that night.

The person who took this pic says bouncers brought various women to Tiger during the three hours he partied at the club.

Austin partied at Body English at the Hard Rock Hotel with his quarterback Tony Romo -- here's a pic of the QB on his way out of the club with our boy from HyphyMarket.com.

Austin had all sorts of cause to celebrate -- dude caught 7 passes for 145 yards and a TD when the 'Boys crushed the Raiders 24-7 ... but if you played against him in your fantasy league, you probably knew that already.

The Mayor let the unbelievable diss loose at a recent auction in Sin City, after a woman he repeatedly said looked like the Divine, red-haired, Vegas performer entered a bid of $2,750 for the item on the auction block.

In the video -- shot from a distance -- Goodman says he won't accept her money because "she's fat and she's short."

The other auctioneer quickly tried to steer the auction back on track ... but the damage had been done.

We got our mitts on these never-before-seen pics that didn't make the final cut of the movie. Included in the bunch -- arm wrestling with Carrot Top, dancing with cowboys, and sleeping on a craps table, Sorry, no elevator oral sex pics in the bunch.

Floyd Mayweather Jr. and a hundred thousand of his closest friends -- plus Diddy, Ray-J, Mario Lopez and Jermaine Dupri -- hung out at XS in the Encore hotel after the Manny Pacquiao fight last night.

Common sense eventually prevailed. Floyd put the money away rather than "make it rain."

We're told Damon and his wife ordered bottles of Jack Daniels and Patron while inside the casino's club Wasted Space -- and as a bonus, Damon's former teammate Jason Giambi sent the happy looking couple a bottle of Dom Perignon.

Not even beer goggles can make Johnny's top attractive.

The UFC kingpin tells TMZ he was changing lanes while cruising through Las Vegas Wednesday afternoon when a "Hyundai rent-a-car" suddenly stopped in front of him -- and Dana smashed into the back of it.

White said his beloved car -- which he had only driven 3 times before the crash -- took the brunt of the blast ... while the Hyundai only suffered a few minor scratches.

As for Dana's condition, he tells us, "I'm fine ... but my heart is broken."

The virgin always survives in horror movies. Somehow Paris did too.

There's something evil lurking in the dark!