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

SISTER, SISTER

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.



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