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Katy Perry through the years

Katy Perry performs at Allphones Arena in Sydney,
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Katy Perry performs at Allphones Arena in Sydney, Australia on Friday, Nov. 21, 2014. (Credit: Getty Images / Mark Metcalfe)

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Rainbow Brite's musical sister Katy Perry first made a mark as the popster behind 2008's "I Kissed a Girl." Currently, she's on her "Prismatic" tour.

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