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Updated: Tue, 06 May 2014 20:30:00 GMT
Stars at the Met Gala over the years

The best and worst gowns from the annual Costume Institute Gala

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Cara Delevingne, Rihanna, Kate Bosworth and Reese Witherspoon posed with Stella McCartney (who designed their outfits) at the Costume Institute Gala Benefit at the Metropolitan Museum of Art in New York.

The annual event is right up there with the Oscars when it comes to celebrity fashion. Click through to see our pick of the most memorable Met Gala gowns in history...