• Christina Aguilera, hanging out at L.A. club The Lobby with husband Jordan Bratman and Flava Flav.

• Luke Wilson, dancing to Michael Jackson’s "Billie Jean" at the opening of New York City club Nest. Also there: Josh Lucas, Ja Rule, Kelis and Eliza Dushku.

• Carey Hart, dining with friends at Sushi Roku in Las Vegas. On another night, rock group The Killers feasted on yellowtail sashimi with diced chilis at the trendy eatery.