Katy Perry stopped by Jimmy Kimmel last night to say "hey" and of course Jimmy being Jimmy he had a little game in mind that was perfect for Katy. "Who Know Katy"?

It was a personal life battle royal between Katy herself and one of her super-fans. Would it nor freak you out if the fan new more than Katy did?

Super stalker deluxe has been going through her garbage or something... lol... It must suck to be rich and famous.... I mean I'm broke as hell and I have to deal with crazy people everyday for free!

Check out Katy on Jimmy:

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