Insider

updated 11/28/2005 AT 01:00 AM EST

originally published 11/28/2005 AT 01:00 AM EST

ONE HOT NIGHT AT ELEMENT
Spotting Hollywood wildlife in their natural habitat was a snap Nov. 8 at Element, the laid-back den that's become a Tuesday night celebrity haven. Stavros Niarchos and Paris Hilton dove into yet another makeout marathon, while Ashlee Simpson got cozy, kissing her band's guitarist—and latest squeeze?—Braxton Olita. In another brick-walled corner, Justin Timberlake and Lil' Jon grinned as Bai Ling table-danced for them, before Justin jumped onstage, grabbed some drumsticks and pounded along with the house percussionist to songs including his own "Like I Love You." Reports one guest: "The dance floor went crazy." Later, JT hopped onto a banquette to groove to Britney Spears's "I'm a Slave 4 U." Paris and her Greek guy were the last celebs to leave, around 1:30 a.m. After a jaunt to Teddy's nearby, they piled into her six-figure Bentley, which Stavros proceeded to plow into a truck, denting and scratching the hood. Says a witness: "It was a wild, wild night."

BIRTHDAY PARTY HOPPING

LEO'S BUDDY SYSTEM
Now that he's single, Leonardo DiCaprio has been doing plenty of male bonding with his buddies, turning up at Lakers games, the Ultimate Fighting Championship finals Nov. 5 in Las Vegas and various nightspots. (While sources confirm that he and on-again, off-again girlfriend Gisele Bündchen have definitely called it quits, at least one Leo confidante I spoke to won't be surprised to see them on-again in the near future.) On Nov. 10 Leo and the boys rang in the actor's 31st at new West Hollywood club the Lobby. Two days later the party-minded crew snuck in through a secret side door to Privilege's VIP room, crashing Nicole Richie's book bash.

TARA REIDand family celebrated her big three-0 Nov. 8 at L.A. Italian eatery Bella, where "the entire restaurant sang to her," says a guest. On Nov. 12 she continued the festivities at Mood and Privilege, where her table was flanked by Leo's and Nicole's. She then took the party to Miami for a Nov. 15 bash at Rok Bar.... On Nov. 9 Nia Long got a sweet gift for her 35th at N.Y.C's Cain: An up-close-and-personal dance from Usher. Says a guest: "It was hot!"... Kelly Osbourne and 30 friends honored her 21st by watching an Agent Provocateur lingerie show from the VIP balcony of Body English at the Hard Rock Las Vegas Nov. 12. "It was unbelievable," Osbourne told Insider.... Fifty pals-including Adrian Grenier and Mandy Moore—rang in Anne Hathaway's 23rd in N.Y.C at a balloon-filled Marquee Nov. 12.

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