Celebrity Photobombs

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Sienna Miller and Cara Delevingne attend the Costume Institute Gala... News PhotoAnnual Event,Art Museum,Arts Culture and Entertainment,Attending,Bestof,Biker Jacket,Burberry Prorsum,Cara Delevingne,Celebrities,Exhibition,Fashion,Gala,Leather,Met Costume Institute Benefit Gala,Metropolitan Museum Of Art,New York City,Photobombing,Sienna Miller,Studded,The Costume Institute,Topics,Topix,USA,VerticalPhotographer Collection: Getty Images Entertainment 2013 Getty ImagesNEW YORK, NY - MAY 06: Sienna Miller (L) and Cara Delevingne attend the Costume Institute Gala for the 'PUNK: Chaos to Couture' exhibition at the Metropolitan Museum of Art on May 6, 2013 in New York City. (Photo by Jamie McCarthy/Getty Images for The Huffington Post)