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