Katy Perry Halloween Costume Ideas
20 Katy Perry Costume Ideas For All You California Gurls
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After Sesame Street refused to air her segment singing with Elmo in 2010, Katy made an appearance on SNL spoofing the whole situation. She really went for it, though, with her Elmo shirt.
What to wear: A very tight and low-cut shirt with Elmo's face on it, and a plaid schoolgirl skirt.