Andres Otero/WENN.com

WHAT SHE WORE Mara joined her sister on the Side Effects red carpet in a drop-waist LBD, deco clutch and edgy Nicholas Kirkwood heels.

CELEBRITY: Kate Mara

DESIGNER: Nicholas Kirkwood

TREND: LBD

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Kate Mara

Kate Mara accessorized her LBD like a pro

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