Mary-Kate Olsen was turning heads at the Metropolitan Opera last night, but was it for the right reasons?

Known for her quirky outfits, the fashionista stepped out in a floor-length gown assessorised with a silver waist belt and clutch.

The star wore her hair in big tousled curls and, for make-up, opted for a bright red pout and smoky eyes.

She even sported a pair of Ozzy Osbourne-style sunglasses!

Mary-Kate was out in New York for the Metropolitan Opera's 125th Anniversary Gala - and she wasn't the only celebrity to turn out in an eye-catching outfit for the event.

Claire Danes, Claudia Schiffer, Becki Newton, Diane Kruger and Kayne West with girlfriend Amber Rose all made an appearance.

Check em' out below