Katy Perry Tweeted THESE photos from American Idol.
Her dress is the Alexander McQueen Leather Biker Dress. Buy it here: ALEXANDER MCQUEEN, BERGDORF GOODMAN, FARFETCH, HARRODS, NEIMAN MARCUS, and NET-A-PORTER
Her earrings are the Bottega Veneta Chain Hoop Earrings. Buy them here: BOTTEGA VENETA and FARFETCH
Her chain necklace is the David Yurman Madison Necklace. Buy it here: DAVID YURMAN
Her other more embellished chain necklace is the Justine Clenquet Lewis Necklace. Buy it here: JUSTINE CLENQUET
Her sandals are the Giuseppe Zanotti Eclissa Sandals. Buy them here: GIUSEPPE ZANOTTI and ORCHARD MILE
Get the look for less here: