Singer Katy Perry London - Arabstoday For the London premiere of her new documentary movie, “Part of Me 3D”, Katy Perry stepped out in a gorgeous Marchesa Fall 2012 dress. The white sleeveless dress was very reminiscent of a ballerina's tutu, complete with a tulle skirt and intricate gold embroidery. Katy paired the dress with Jimmy Choo “Lauren” diamanté-and-suede strappy sandals .A sleek bun kept the focus on the frock and totally matched the pretty, ballerina vibe she was channeling. Flawless makeup and a polka-dot pedicure completed her look. The singer recently revealed that she is eyeing a romance with British royal Prince Harry.