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David Archuleta

Todd Williamson/Getty Images

IDOL THOUGHT: David Archuleta, hitting Jason Mraz's concert at the Greek Theatre in Hollywood.

DELI DELIGHTS: Britney Spears, having lunch at Jerry's Deli in Studio City, Calif., the day after Justin Timberlake was there having dinner with Jessica Biel.

JACKO-LANTERN: Michael Jackson, surprising Natalie Maines and Adrian Pasdar by bringing his kids to a Halloween party at their L.A.-area home.

MOORE LOVIN': Ashton Kutcher and Demi Moore, having dinner at Pace in Los Angeles the night after hitting Roman Coppola and Jacqui Getty's Halloween party at Bardot in Hollywood.

DRIVER'S SEAT: Nelly, receiving a new Ford Flex from the motor company at his surprise birthday party at Lavo NIghtclub at the Palazzo in Las Vegas.

FISHY BUSINESS: Kate Bosworth, enjoying yellowtail and tuna dishes followed by a chocolate dessert at Sushi Roku in Hollywood.

ROCK THE VOTE: Julia Louis-Dreyfus, taking a break from campaigning for Barack Obama in Las Vegas with dinner at Stack Restaurant & Bar at the Mirage.

BOY CRAZY: Mel B, jumping onstage to dance with Estelle, singing her hit "American Boy" at club Mur.mur at the Borgata Hotel Casino & Spa in Atlantic City.

ECO-FRIENDLY: Rafi Gavron, of Nick and Norah's Infinite Playlist, and Emmanuelle Chriqui, drinking from Coca-Cola's new aluminum bottles at the James Jeans Eco event in New York.

POLITICALLY PROUD: Monique Coleman, Nancy Cartwright and Incubus' Brandon Boyd, hitting the Donkaphant Film Festival at L.A.'s Skirball Center.

—Additional reporting by Dahvi Shira and Claudia Rosenbaum