Paris Hilton, "enjoying the fun under the moonlight" with Nicole Richie and Travis Barker at Hollywood club Les Deux. "Travis took turns chatting with his buddies and Paris," an onlooker tells us. "They weren't affectionate, but they did look happy together."
Colin Farrell, catching an 8 p.m. showing of Babel at ArcLight Cinemas in Hollywood. The actor and a friend were "munching on milk duds," says a moviegoer.
Sienna Miller, taking pictures with pals at New York City club Butter. The actress arrived a bit before midnight sporting a tilted black fedora, black coat, miniskirt and mid-calf boots, and spent the night sipping water. Later, she was joined in the booth by a dark-haired male companion (who seemed to be just a friend).
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Jack Osbourne, celebrating his 21st birthday at the Mirage Hotel and Casino and Jet Nightclub in Las Vegas. The birthday boy spent the night sipping on Red Bull and partying with friends including Kimberly Stewart.
My Name is Earl star Jason Lee, shopping at vintage clothing store Squaresville in Los Feliz, Calif.
Nicollette Sheridan, dining with a female friend at Beverly Hills eatery Mr. Chow. "They were giggling, enjoying themselves," says a diner.
Sylvain Gaboury / FilmMagic
By SHERMAKAYE BASS, MARK GRAY, TIFFANY HOPKINS, PRIYA MOHAN and JEFFREY SLONIM