Hilton makes time for an impromptu autograph session while in South Africa with beau Benji Madden. Plus: Fergie, Vanessa Hudgens, Johnny Depp and more

DRINK TO THAT

Lucy Liu steps forward in her official role as a UNICEF ambassador – kicking off the Tap Project on Wednesday at the Hearst Tower in New York. The campaign is committed to providing clean drinking water for children around the world.