Katy Perry is prepping for the Super Bowl's halftime show. What's on her agenda? Checking her dancer's cleavage, texting with Bruno Mars and letting a little trash talk slip regarding a certain crossover diva.

Backstage at the top-secret rehearsals for the biggest gig in American showbiz, in a large, stuffy room marked "Wardrobe," a dozen or so half-naked female dancers wriggle into candy-colored, body-hugging costumes and pull on matching socks and sneakers. At the center of the action is Katy Perry, lying belly-down on a massage table with one bare leg poking out from under a blanket -- simultaneously getting treatment for a bad hamstring and giving notes on her dancers' and bandmembers' costumes. "It's obscene, I know," Perry says, referring to her elaborate multitasking.

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