Katy Perry at the Scottrade Center

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She jumped off the stage, then over fence separating her from the floor seats, and moon walked halfway down the long aisle. Utter pandemonium. She took off at a sprint, then leapt on the back of a masked backup dancer, who carried her, rushing, around the arena, back to the side of the stage, under a curtain, never to reemerge. Click here to continue reading Kiernan Maletsky's review of Katy Perry and Janelle Monae at the Scottrade Center. Photos by Jon Gitchoff.