Caught in the Act!

Caught in the Act!
Britney Spears and JC Chasez

02/09/2007 AT 06:30 PM EST

Britney Spears, beginning a night of clubbing with mashed potatoes and chocolate cake at French brasserie Rue 57 before heading to Marquee, where she met up with old pal JC Chasez and danced in the deejay booth to Madonna's "Vogue." Next stop: hot spot Tenjune, where she partied with two girlfriends, a bodyguard and a male companion until 4 a.m. Her night on the town ended with a stop at McDonald's for a late-night snack.

Cameron Diaz, leaving West Hollywood's Gym on Nemo Street after a workout. It was an Angelic day at the fitness center: Diaz's Charlie's Angels costar, Lucy Liu, also pumped iron there. If Drew Barrymore showed, the reunion would have been complete...

Jennifer Aniston, dining with two female pals at Beverly Hills eatery Spago. On the table: Cantonese-style roasted duck. "They were having a terrific time," an onlooker tells us.

Ashlee Simpson, holding hands with a female pal as she made her way to the bathroom during rock band Ringside's concert at the Roxy in West Hollywood. Also in the house to support Brothers & Sisters actor Balthazar Getty's group: His costar Dave Annable, who got cozy with Grey's Anatomy star Kate Walsh, Eric Dane, Justin Chambers, David Arquette and newly single Cisco Adler.

Kevin Federline, surrounded by five bodyguards and a large posse of more than 15 people at West Hollywood club Area. The sharp-dressed rapper, who wore a collared shirt and sport jacket, drank bottle-service cocktails and smoked cigarettes as he chatted with the ladies around him and partied with Wilmer Valderrama. Also making the scene: Jermaine Dupri, who stood on top of his VIP table, and Dane Cook, who hung out near the bar and talked to friends.

Paris Hilton, looking at Hello Kitty and Strawberry Shortcake dolls at West Hollywood novelty store Aahs.

Justin Timberlake, dancing at the Black Eyed Peas concert at Hollywood club Avalon. The Grammy nominee was content to play fan in the audience. When the band (with whom he collaborated on their hit 2003 song "Where Is The Love?") invited him on stage, "he just laughed and continued having fun with his friends," says a concertgoer.


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