Katy Perry at the 2010 AMAs

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Katy Perry at American Music Awards

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Katy Perry at American Music Awards

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Katy Perry at American Music Awards

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Taylor Swift at American Music Awards

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Taylor Swift at American Music Awards

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Taylor Swift at American Music Awards

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Taylor Swift at American Music Awards

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Katy Perry at Kids' Choice Awards

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Katy Perry at Kids' Choice Awards

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Rihanna at American Music Awards

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Woman in sequin dress on red carpet

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