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!