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    Cara Delevingne Plays "Whose Ass Is That?" With Victoria's Secret Angels: Can You Guess?!

    Cara Delevingne, Instagram Instagram

    Can you guess whose ass is that?!

    Cara Delevingne can! But the Victoria's Secret stunner, who is known for her sassy sense of humor, may be the only one, sharing a sexy Instagram video of all of the Victoria Secret Angels' bums ahead of the VS fashion show tonight.

    "Who's ass is that" the 21-year-old beauty captioned the clip, tagging many of the models, including Candice Swanepoel, Behati Prinsloo, Constance Jablonski, Sigrid Agren, Alessandra Ambrosio, Lily Aldridge, Doutzen Kroes, Karlie Kloss, Toni Garrn, Caroline Brasch, Monika Jagaciak, Jessica Hart, Kasia Struss, Kelly Gale, Jourdan Dunn, Joan Smalls, Lily Donaldson and Adriana Lima.

    PHOTO: Miranda Kerr wishes Victoria's Secret Angels good luck at today's fashion show

    The supermodels, who are preparing to strut their stuff on the catwalk in a bevy of barely-there outfits on Wednesday, Nov. 13, certainly aren't afraid to show off their enviable backsides in the video (sorry, fellas, they aren't wearing lingerie...yet), while getting silly and flaunting their pin-thin frames.

    "Hello!," "butt shot," "spread 'em," "grr" are just a few of the phrases the lovely ladies say as one beauty gives her booty a slap for the camera, rocking a pair of black leather pants.

    Safe to say Delevingne is doing her part in amping up extra excitement for the show.

    PHOTOS: Victoria's Secret 2012 fashion show

    Cara Delevingne, Instagram Instagram

    In addition to her Instagram video, Cara also posted a pic of herself scarfing down a burger and fries with fellow Angel Candice Swanepoel ahead of sexy televised event (not fair!).

    "#regram @jeromeduran @angelcandices prep for the show #vsfashionshow#howwedo," she wrote.

    Yesterday, the model of the moment posted several Instagram pictures with fellow Angels Karlie Kloss and Jourdan Dunn during what appeared to be a dress rehearsal for tonight's show, calling the gorgeous trio the "power puff girls" and gushing "I missed my angels!"

    Taylor Swift will be performing at the annual show, which will be recorded tonight at the Lexington Armory, but will not be broadcast until Dec. 10 on CBS. Fall Out Boy, Neon Jungle and Great Big World are also scheduled to perform.

    PHOTOS: Victoria's Secret fantasy bras