The 'Roar' hitmaker, who performed in Miami on July 3, was photographed posing with Minnie and Mickey Mouse at the Walt Disney World Resort in Lake Buena Vista, Fla.
Sporting two top knots and red lipstick, Perry, 29, made playful poses with the characters.
Perry then took to Twitter to share the excitement.
"Oh my God! I have the wifi password to the Cinderella castle @WaltDisneyWorld. Dreams do come true," she tweeted.