Katy Perry Uncovered

Katy Perry, who's been exercising her butt off (not to mention tummy, thighs and everything else!) at the gym this summer, is showing off her hard work in the cover of Rolling Stone.

Wearing a surprisingly subdued pink bra and panties (hey, this is the woman who wore a cupcake bra that discharged whipped cream in her latest vid), the soon-to-be Mrs. Brand seems to be in tip-top shape to fit into her wedding dress. (The singer is set to wed her boyfriend of barely a year, Russell Brand, over New Year's in India, where they were engaged.)

Katy's latest single off her new album, "California Gurls", is a summer smash, and just garnered the beauty two VMA noms.

But with a hot bod, hot career and hot fiance, don't call Katy lucky. "I wasn't ever able to say I was 'lucky' because my mother would rather us say that we were blessed, and she also didn't like that lucky sounded like Lucifer," Katy told the mag. "Deviled eggs were called 'angelled' eggs. I wasn't allowed to eat Lucky Charms, but I think that was the sugar. I think my mom lied to me about that one."

But Katy has clearly rebelled -- and it looks good on her!