In honor of Halloween, we’ve enlisted The Queen of Costumes Katy Perry to get us in the spirit. The pop star teamed up with PopChips for a spooky-themed ad, and we’re giving away the exact dress she wore for her Elvira-inspired look! Today is the last day to enter to win her sheer mesh Brian Lichtenberg style. Click below to enter for a chance to win, and good luck—the contest ends tomorrow. Happy Halloween!