Katy Perry's metallic green dress from American Idol

Katy Perry Tweeted THIS PHOTO from American Idol.

Buy the exact same dress here:

She is wearing the Rick Owens Prong Iridescent Keyhole Cutout Coated Denim Strapless Gown. Buy it here: FWRD, MYTHERESA, NORDSTROM, and SSENSE

Get the look for less here:

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