Some of her personalities included Ace the Animal Trainer, Mandee the Princess, Yosef the MC and Kriss the Clown. Let's just say each one was even more of a disaster than the last.
It was kind of funny for a little while, but we're not down with the crashing the old people party part because we felt really bad for them. Also, at one of the kid's parties, she stages a car accident--in front of the kids-- and we didn't exactly find ourselves LOL-ing at that.
Check out the video above to see Katy pranking various party-goers and let us know what you think.
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Gallery | Katy Perry's Red Carpet Style