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WATCH: Katy Perry In-Studio

WATCH: Katy Perry In-Studio

PHOTOS: Katy Perry In-Studio

Katy Perry made a surprise visit to Elvis Duran and the Z100 Morning Show today, showing up in her Prism truck!

Watch what she told us about her brand-new single, "Roar," what to expect from Prism, all the changes in her life she's gone through recently, tweeting with Lady Gaga and more!

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