Behind the Scenes - Katy Perry Performs "E.T." on American Idol!

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Behind the Scenes - Katy Perry Performs "E.T." on American Idol! with tags katy, perry, american, idol, e.t., kanye, west, alien, costumes, choreography, sneak peak

Watch Katy's crew prepare the ExtraTerrestrial costumes and dance choreography for her upcoming performance of "E.T." on American Idol THIS THURSDAY, 4/21!

Watch Katy Perry perform "E.T." on American Idol this Thursday, April 21 at 8/7c on Fox.