May 11, 2007 05:14 PM

Ashley and Mary-Kate Olsen have long shared many of their favorite accessories — from their Prada turban to their perilously high heels — and their studded Azzedine Alaia belt is no exception! Mary-Kate wore her waist-cincher over her Lily et Cie gown to the Costume Institute Gala on Monday, while sister Ashley topped a teeny mini skirt with the belt on Wednesday night. We love that with all of the Olsen’s mega-bucks, they still love to share! Tell us: Who wears the belt better: Ashley or Mary-Kate?

Click here to see more of the accessories that stylish star families love to share.

Photo:inf; bauer-griffin

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