Hot Vegas

With Harry and Hermione nowhere in sight, "Harry Potter" star Rupert Grint partied at Chateau Nightclub in Las Vegas last night.

Heidi Montag reminded every one she still exists last night, hosting her birthday party at Vanity Nightclub in Las Vegas.

Last season's "BIg Brother" "Bachelor Pad" winners David Good and Natalie Getz soaked up the sun, drinks and their fellow former cast mates at Nikki Beach at the Tropicana in Vegas this weekend.

Kelly Rowland has found a surefire way to make sure her boobs don't fall out of the bottom of her shirt again ... she got a longer shirt.

Rowland hit the stage at the Chateau nightclub at the Paris Hotel in Vegas this weekend and to the disappointment of pervs everywhere, no wardrobe malfunctions were reported ... unlike her show in Jersey a few weeks ago -- where she let it all hang out.

Jwoww, in all her natural beauty, played the role of host at PURE nightclub in Las Vegas last night.

While Kim Kardashian was trading "I Do's" in Montecito ... the guy who helped thrust her into superstardom was still taking credit for his conquest during a performance in Vegas ... TMZ has learned.

Ray J hit the stage at the Chateau nightclub in the Paris Hotel ... when people began asking him how he felt about his former sex tape partner's wedding.

A TMZ staffer who was in the crowd says Ray J simply smiled ... and quipped, "I did that."

Fans continued to plead with Ray J to share his thoughts on the wedding, but he wouldn't open up ... mostly laughing every time someone brought up her name.

Apparently, Ray J has moved on ... after his performance, he was getting up close and personal with a mystery lady.

If you hire Young MC to play a concert, you want to hear "Bust a Move" -- and if you hire The Situation to host a party in Las Vegas, you want him to show off his abs ... like he did last night at Gallery nightclub.

Ron Artest enjoyed what could be his last weekend in Las Vegas as Ron Artest -- partying it up at at Chateau Nightclub & Gardens at Paris Las Vegas last night.

Ron Ron's trip wasn't all about clubbin' -- he hit up a Celine Dion show and tweeted how it made him and his boys cry. Street cred ... gone.

Ex-"Baywatch" star Jeremy Jackson is currently in a meeting with honchos at Chippendales in Las Vegas -- and we're told, both parties are trying to hash out a deal for the actor to join the bow-tied bunch on a full-time basis.

Jeremy's rep tells TMZ, the former child actor is on deck to fill an empty celebrity host spot ... following 98 Degrees singer Jeff Timmons -- but unlike Jeff's short stint ... this would be a long-term deal.

We're told Jeremy is extremely serious about the gig -- going to Vegas last weekend to try on the bow tie and shirt cuffs (above) just to get a feel for the experience.

And that's not it ... we're told Jeremy's also been working out non-stop to prep for the position -- and after entering "Celebrity Rehab" earlier this year for a hormone-injecting fitness addiction ... he's doing it ALL-NATURALLY.

We're told an announcement is expected to be made shortly.

Sam Ronson was arrested this morning for DUI outside Baker, California -- home of the world's biggest thermometer --TMZ has learned.

According to the booking sheet, 33-year-old Ronson is listed as 5'7" and 102 pounds.

Law enforcement sources tell TMZ, Lindsay Lohan's ex-girlfriend was driving home from Las Vegas at 10:30AM in her black Porsche when she was pulled over for speeding.

We're told she was given a field sobriety test and didn't perform well. According to our sources, she refused to take what is commonly called a "roadside blow" -- a less-scientific breathalyzer, which is not a mandatory test. She was arrested at the scene.

Ronson was transported to the Baker substation, where we're told she blew over the legal limit. According to sources, she was cooperative the entire time.

Sam DJ'd last night at the Lavo nightclub in the Palazzo hotel in Vegas.

Thanks to our friends at SpyOnVegas.com for the pic.

Melissa Molinaro -- that chick in the Old Navy commercial that looks just like Kim Kardashian -- brought her bootyful talents to the stage lit up table at Las Vegas gay club Piranha this weekend.

Last month, Kardashian filed a lawsuit against Old Navy because she claims they hired Melissa to dupe the public into thinking Kim is affiliated with the clothing giant.

As TMZ first reported, the Hoff and GF Hayley got into it in their hotel room at the Wynn ... to the point where Hayley called for security.

But the couple put on their best face and made their way down to Blush ... where the Hoff celebrated his 59th birthday ... as if nothing ever happened.

Earlier in the day, Hoff and Hayley hung out by the pool where he put on his "Baywatch" best, much to the delight of the crowd.

Hasselhoff was at the Wynn to celebrate his 59th birthday. His friends were throwing the bash for him at Blush, inside the hotel.

But early this evening, Hasselhoff's girlfriend called for security and one source says she appeared to have been in some sort of distress.

Security came ... and for a while there was some question as to whether David would make it to his own party, But now we're told David will indeed show up -- he's scheduled to walk the red carpet with his girlfriend at 11 PM.

Josh Lewis repossessed the tatas of a woman (consensually, we're told) at Pure nightclub -- and based on the picture, he couldn't be happier to be alive.