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American Idol 2010: Guest Judges Galore

Katy Perry

F Micelotta/American Idol 2009/Getty Images

While we don't advise aspiring Idols to emulate Perry's sartorial style, they could do a lot worse than stealing a page from her sweet 'n' spunky personality playbook. They might want to try sounding like the husky-voiced hitmaker, too.

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