This Katy Perry photo contains
gown, dinner dress, dinner gown, formal, evening gown, bridesmaid, and maid of honor.
There might also be
gown, robe, balldress, and tea gown.
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!