Caught in the Act

07/05/2006 at 06:00 AM EDT

• Cameron Diaz and Justin Timberlake, wearing "perma-grins on their faces" as they rocked out at the Gnarls Barkley show at Paris club Bataclan. The couple – "who looked happy together," a source tell us – watched the performance from the side of the stage along with pal Drew Barrymore. "We couldn't believe how skinny Drew got! She looks better than ever," says the source. "Everyone was just staring at how hot she looked."

• Jennifer Love Hewitt, rummaging through the clothes at the Billion Dollar Babes sample sale in Culver City, Calif. Also shopping for bargains: Taryn Manning and Sara Rue.

• Drew Lachey, hanging out with wife Lea and a group of pals (including Jessica Simpson's BFF CaCee Cobb) in a booth at L.A. club Shag.

• Zach Braff, chatting on his cell phone while strolling with a male buddy in midtown Manhattan.

• Miro Sorvino and husband Christopher Backus, gazing into each other's eyes and sipping cocktails at West Hollywood eatery Republic.

• R&B singer Ray J (a.k.a. Brandy's younger brother) and Kim Kardashian, "flirting and canoodling" on the Malibu set of his video for "Let's Play House," a source tells us. Nick Lachey's former gal pal "is a real good friend before anything," says Ray J of Kardashian, who's his stylist and plays his love interest in the clip. So, is their onscreen pairing art imitating life or life imitating art? "A little bit of both," Kardashian told us with a giggle.

Hilary Duff

Eddie Mejia / Splash

• Hilary Duff, partying with sister Haylie in the VIP section of L.A. club Privilege. Also making the scene: Mike Tyson and a large group of his friends, who sat at a separate table.

• Jesse Metcalfe, whispering into actress girlfriend Nadine Coyle's ear at West Hollywood club Hyde.

• Wilmer Valderrama, Danny Masterson and Topher Grace, chilling out together at New York City club BED while a bevy of Ford and Wilhelmina models tried to get their attention.

• By CARRIE BORZILLO-VRENNA, LISA INGRASSIA, SERENA KAPPES and MICHELLE TAN