Someone was walking away with an autographed Katy Perry pillow or a Katy Perry scrapbook on last night's Jimmy Kimmel Live after playing "Who Knows Katy?"

Katy Perry super fan Emily competed head to head against Katy Perry herself in a quiz show skit last night to see who knew Katy the best. Before the game began Jimmy revealed that Emily had a wall in her home dedicated to the pop superstar and that her boyfriend recently made her take it all down. After confirming that, Katy Perry replied with, "At least you have a boyfriend!"

Jimmy Kimmel started out with some easy questions, but they got harder as the game went on. Watch the video to find out who ultimately wins "Who Knows Katy?"