Behind the Scenes Katy Perry Performs on American Idol

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Watch Katy s crew prepare the ExtraTerrestrial costumes and dance choreography for her upcoming performance of on American Idol THIS THURSDAY, 4, 21 Check out the official music video, featuring Kanye West, here: Watch Katy Perry perform on American Idol this Thursday, April 21 at 8, 7c on Fox. Get featuring Kanye West on iTunes here: