WHAT SHE WORE Rachel McAdams made an entrance at the L.A. premiere of Sherlock Holmes: A Game of Shadows in an embroidered Marchesa gown and diamond studs.

WHY WE LOVE IT The actress sparkled front-to-back and head-to-toe in one of this season's hottest party trends.

CELEBRITY: Rachel McAdams

DESIGNER: Marchesa

TREND: Draping

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Rachel McAdams

Rachel McAdams in Marchesa