Neil Rasmus/BFAnyc/Sipa

WHAT SHE WORE Rooney Mara took in the Calvin Klein show in the brand's knee-length LBD and ankle-strap heels.

WHY WE LOVE IT The minimalist American label and the sleek dresser are a match made in fashion heaven!

CELEBRITY: Rooney Mara

DESIGNER: Calvin Klein

TREND: Black

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Rooney Mara

Rooney Mara