Even though she's no stranger to showing off some skin, "Umbrella" singer Rihanna has said that she would have to turn down an offer to be photographed in the buff by Playboy. The young singer, who often dresses with a playful dominatrix edge, said, "I am only 20 so my mother would kill me if I posed nude!"

And even though she didn't mention it (because they're still tyring to keep their romantic relationship out of the public eye), her sometimes undercover boyfriend Chris Brown might not be too keen on having the leering on his girlfriend's goodies.

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