Katy Perry Tweeted THIS PHOTO.
Buy the exact same outfit that Katie is wearing here:
Her dress is the New Arrivals Fringe Sequin Mini Dress. Buy it here: ITALIST, BALTINI, FARFETCH, and MODA OPERANDI
Her necklace is the Swarovski Millenia Necklace. Buy it here: SWAROVSKI
Her shoes are the Amina Muaddi Tina Metallic Crystal Charm Ankle-Wrap Sandals. Buy them here: FWRD, INTERMIX, MATCHES FASHION, NEIMAN MARCUS, NET-A-PORTER, NORDSTROM, and SAKS FIFTH AVENUE
Get the look for less here: