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

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! Check out the official "E.T." music video, featuring Kanye West, here: http://goo.gl/hlW3k Watch Katy Perry perform "E.T." on American Idol this Thursday, April 21 at 8/7c on Fox. Get "E.T." featuring Kanye West on iTunes here: http://goo.gl/W4q1o