#KatyPerry is among the world’s biggest pop stars, but she’s also penned...

#KatyPerry is among the world’s biggest pop stars, but she’s also penned hits fo…

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#KatyPerry is among the world’s biggest pop stars, but she’s also penned hits for everyone from #KellyClarkson to #SelenaGomez. She also wrote the #NikkiMinaj track #GetOnYourKnees, which features #ArianaGrande. A list of her biggest writing credits is on RollingStone.com. Photograph by John Shearer