This article is about the American Billboard Hot 100 chart held during the 2010s. Katy Perry inspired T-Shirts, Posters, Mugs and more by independent artists and designers from around the world.All orders are custom made. Katy Perry's music for over a decade now - we're still obsessed. It's no wonder Katy Perry loves herself a costume, and it seems that enthusiasm has carried over to love interest John Mayer. I felt bad for Katy, some of the hottest photos ever.
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