Leather plus attitude equals one hot shoot. Plus: Gwen & Gavin, Jessica Simpson, Paris Hilton and more


A newly brunette Haylie Duff joins sister Hilary in promoting their first ad campaign together (for breath mints) in New York on Thursday. It's just one of a string of collaborations for the sibs: They're also costarring in the big-screen comedy Material Girls, which begins filming this month.