Gavin Rossdale and Gwen Stefani Photo by: RAMEY
Caught in the Act! | Gwen Stefani
Gwen Stefani and Gavin Rossdale, dining at Cut restaurant at the Regent Beverly Wilshire hotel. After their meal, they had drinks with pals Shaquille O'Neal and rapper Eve.

Eva Mendes, Michelle Trachtenberg, Fall Out Boy's Pete Wentz, Maroon 5 singer Adam Levine and Incubus frontman Brandon Boyd, chilling out at a Gnarls Barkley afterparty at club Avalon Hollywood. Trachtenberg and Wentz didn't leave each other's side all night, and the rocker often had his hand on the small of her back. Could romance be in the air?

Brooke Shields, spending time with husband Chris Henchy and daughters Rowan and Grier at the Mercedes-Benz Polo Challenge in Bridgehampton, N.Y. "I am such an East Coast addict," the actress told us. "I came all the way out here from the West Coast just for this."

Orlando Bloom and Kate Bosworth, drinking bellinis and eating pie with Eric Bana (Bloom's Troy costar) on the patio of L.A.'s Il Sole. A few days later, Scarlett Johansson dined on minestrone soup at the Italian eatery while Kate Hudson had cocktails nearby.

Tom Hanks, checking out the Spy Museum in Washington, D.C., with two of his sons. It wasn't just a family vacation: The Oscar winner was also doing research for his upcoming role as the titular Texas congressman in Charlie Wilson's War. Hanks stopped into the gift shop and bought several puzzles, telling clerks that he was really into "lateral thinking games." Is he still trying to crack The Da Vinci Code?

Kate Beckinsale, shopping with her daughter Lily and a girlfriend at Planet Blue in Santa Monica.

Michelle Williams and Heath Ledger with Matilda in 2006 Photo by: ALECSEY BOLDESKUL
Caught in the Act!| Michelle Williams (Actress)
Nelly, promoting his Apple Bottoms denim line at Macy's in Torrance, Calif. The busy rapper-designer says he has no time for a vacation anytime soon. "When I'm dead," he told us.

Heath Ledger and Michelle Williams, strolling with daughter Matilda at the Hollywood Farmers Market. The couple – Ledger looking scruffy with his beard and Williams wearing a white dress and flip-flops – picked out corn and sampled raw milk as their baby girl slept peacefully in her stroller.

• By MAUREEN HARRINGTON, JESSICA HERNDON, EMILY HOCHBERG, MARISA LAUDADIO, SARA LIBBY, BRENDA RODRIGUEZ and JEFFREY SLONIM