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Katy Perry performs in concert at the Pepsi Music festival in Buenos Aires, Argentina, Tuesday Sept. 27, 2011
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Katy Perry, second from right, performs in concert at the Pepsi Music festival in Buenos Aires, Argentina, Tuesday Sept. 27, 2011
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Katy Perry, left, performs in concert at the Pepsi Music festival in Buenos Aires, Argentina, Tuesday, Sept. 27, 2011