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We were wondering what Nicole Richie was hiding underneath that chic leather jacket, and the starlet didn't disappoint!

While this frock looks like a cross between a formal dress and a slip, Nicole definitely worked it as she posed for pictures at Le 66 on Champs Elysees, where she launched her new Winter Kate clothing line. Ooh la la! We bet Joel's proud of his lady love - er, make that fiancee!