Rihanna loves showing off her tits. It's true. If you've seen any of her recent album covers, or any of her myriad nipple slips, it's clear. I mean, she never wears a bra. And why should she? Her breasts are spectacular. Anyway, last night Rihanna was wearing a white see-through dress, and you know what that means: Rihanna nipple slip! Sweet.