Justin Gaston has certainly attracted a lot of attention thanks to being the older beau of tween sensation Miley Cyrus, but is the 20-year-old enjoying his new found fame a little too much?

Gaston got his groove on Saturday night at Christian Audigier’s daughter Crystal’s birthday bash at Hollywood hotspot the Kress, sans Cyrus on the eve of her own Sweet 16. The professional underwear model caused a stir by appearing in Audigier’s rooftop fashion show but according to our insider, Gaston ran around shirtless after his strutting duties were over.

“He was flirting and definitely wasn’t acting like a guy with a girlfriend,” said our source, adding that Gaston approached a bunch of gorgeous gals without his shirt and had his pants uber low.

Despite the age gap between Miley and Justin, the “Hannah Montana” star’s father is (or at least was) very supportive of the young romance and told Tarts last month that Gaston was “a great and really talented guy.”

Paris Snubs Benji for Christian Audigier

Despite telling party planners that she would probably still step out to Hollywood's Ecco Ultra Lounge on Saturday night to support her ex-beau Benji Madden for his band's "Greatest Remixes" album release party, the hotel heiress instead chose to get down and dirty at Crystal Audigier’s birthday bender.

Paris is clearly reveling in her new single status (and coincidental resurgence on the Hollywood social scene) as she lapped up lots of male attention while donning bright pink from head-to-toe. The heiress partied alongside her little sis, Nicky, as well as Khloe Kardashian and performers for the night the Pussycat Dolls and T.I.

But we have to hand it to Hilton, she is certainly not letting her ruptured romance keep her in mourning as Pop Tarts spies also spotted her Thursday with her sister at the celeb-infested Mr. Chow's, followed by a wild Friday night with Avril Lavigne at Villa (the galpals came out holding hands), Saturday night was spent at the Kress, then Sunday evening she hosted the Pussycat Dolls post-American Music Awards bash at the Viper Room.

But Benji isn't in hiding either; he appeared to be in good spirits on Saturday while livin' it up with his brothers and bandmates until the early hours. Madden then took to the turntables on Sunday at Las Vegas hotspot Wasted Space inside the Hard Rock Hotel & Casino while hanging out alongside Pink’s (separated) hubby, Carey Hart.

“Benji even did some harmless flirting with some cute girls at the bar,” our source said.

Stephanie Pratt and Audrina Patridge Pumped for Newlyweds Heidi & Spencer

The normally press-hungry reality duo Heidi Montag and Spencer Pratt are now officially husband and wife after eloping to Cabo San Lucas, Mexico, for the quickie ceremony.

Spencer’s sister Stephanie Pratt confirmed the nuptials, which took place last week and the exclusive pics are set to appear in this week’s Us Weekly.

“I am so happy for them,” Montag’s new sister-in-law told Tarts. “They were totally made for each other.”

“The Hills” co-star Audrina Patridge also expressed her enthusiasm.

“I’m very excited for Heidi and Spencer and wish them a lifetime of happiness together,” she told us in a statement.

In 2007, Pratt presented his leading lady with a rock after just eight months together, but the wedding was later called off after months due to the constant bickering between the young lovers.

Sinning in the City: Becks Goes Big, Paula Parties With Holly Madison and Statham Is Over Working on Street Corners

It was another wild weekend in Las Vegas as Hollywood descended upon the City of Sins.

David Beckham was part of Studio 54's British Invasion on Saturday evening as he celebrated his homegrown boxer Ricky "The Hitman" Hatton's victory alongside "Oasis" bad boys Noel and Liam Gallagher.

The shy soccer star attracted hundreds of screaming gals and apparently got so freaked out by the fan frenzy he called it an early night. Extra security was reportedly called in to escort Beckham back to his $25,000 per night Hardwood Suite inside the Fantasy Tower of the Palms. The suite is 10,000 square feet and comes with an indoor regulation half-basketball court.

Meanwhile over at LAX, Paula Abdul did some well-deserved dancing and letting loose (given her tumultuous week involving her rumored stalker's death outside her house) with none other then "Mindfreak" Criss Angel and Hef's former flame Holly Madison. According to insiders, the trio took to a table on the main VIP stage of the chic club and drank Montecristo Rum (Paula passed on the booze) until the early hours.

Also spotted strutting thru the Strip was Hayden Panettiere (who unveiled her new clutch at the Venetian and stayed in the Palms Fantasy Tower), the three Kardashian sisters and brother Robert who enjoyed the Usher concert on Friday night before hitting up LAX while Usher himself chilled out post-performance at PURE with Nick Cannon.

Pop Tarts spies also came across womanizer Ryan Cabrera chatting up the ladies in VIP at the Bank while actors Sylvester Stallone and Jason Statham celebrated the release of "Transporter 3" until 4 a.m. at Planet Hollywood's Prive on Thursday.

"I'm filming a new movie in New York at the moment so limited drinking, I'm behaving," Statham told Tarts. "I used to work on street corners selling fake perfumes and jewelry; I'm quite happy doing what I'm doing and don't want to go back."