{blackbabes} Rihanna Shows Off Her Bum in Sexy Rear End Twitpic

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Rihanna is following in Justin Bieber's bum-flashing footsteps.

A day after the Biebs dropped his pants for a half-moon Instagram pic over the weekend, the 24-year-old Barbadian songstress took to Twitter to post a sexy close-up photo of her rear end.

Dressed in a body-hugging white leotard, RiRi flaunts her bodacious backside while facing away from the camera (but still giving a sultry glance over her shoulder).

"Lights. Camera. Action #alliseeizsignz," Rihanna wrote along with the superhot black-and-white shot.

Leave it to RiRi to always have a sexy twitpic up her sleeve!