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BROOKLYN, N.Y., SEPT. 4 Ashton Kutcher channels fellow skateboarder Bart Simpson on a ride through the set of his upcoming comedy, What Happens in Vegas....

NEW YORK CITY, AUG. 30 Happy 35th! While filming on the streets of Manhattan, Cameron Diaz receives birthday balloons and a card. So where's the cake?

PACIFIC PALISADES, CALIF., SEPT. 4 Bridget Moynahan goes for a stroll with her one-week-old son John Edward Thomas Moynahan and her mom Mary.

SAINT-TROPEZ, SEPT. 1 Hold on tight! Anne Hathaway and boyfriend Raffaello Follieri throw their vacation into high gear with some high-speed water sports.

NEW YORK CITY, AUG. 29 Gwyneth Paltrow steps out for some shopping, hitting the Kirna Zabête boutique in SoHo.

ATLANTIC CITY, SEPT. 2 Amped by an entourage all his own, Adrian Grenier plays guitar with his band, the Honey Brothers, at the Pool at Harrah's resort.

BRENTWOOD, CALIF., SEPT. 1 Marcia Cross gets her Labor Day weekend into full swing with twin daughters Eden and Savannah at a local park.

LONDON, AUG. 29 Looking all set for back-to-school (not Hogwarts, natch), Emma Watson strolls on the set of her upcoming BBC movie, Ballet Shoes.

MALIBU, AUG. 29 The Hills star Lauren Conrad splashes through the surf with Hollywood's best summer accessory—the boogie board.

BRIDGEHAMPTON, N.Y., SEPT. 2 Christie Brinkley beams while taking in the Hampton Classic Horse Show.

BEVERLY HILLS, SEPT. 1 Jenny McCarthy looks like a star in stripes (and shades) as she shops with 5-year-old son Evan.

BEVERLY HILLS, SEPT. 1 The secret to Jessica Simpson's fabulous physique might just be ... protein! Which could easily explain this visit to Ruth's Chris Steakhouse.

MIAMI, SEPT. 1 A groovy Gloria Estefan (with daughter Emily, 12, and husband Emilio) gets into the spirit of her disco-themed 50th-birthday party. Guests at the bash, held at Ice Palace Film Studios, included Rachael Ray.

NEW YORK CITY, AUG. 31 Country couple Tim McGraw and Faith Hill hit the city streets. While in Manhattan, Hill taped an episode of The Ellen DeGeneres Show, where she debuted her new song "Red Umbrella."