As her numerous hairstyles can attest, Rihanna's not one to pick a look and stick with it--and her mercurial fashion sense applies to her nipples, too. She's decorated her breasts with barbells, bare skin, and whatever style of jewelry is in this picture; and now she's embraced her inner punk with a nipple spike.
But wait, you ask: how does that tie in to this "Teenage Fantasy" hat she's rocking? We're still working that one out, but if we'd have to wager a guess, we'd offer that, you know, it's Rihanna. Are you going to tell her she isn't a teenage fantasy?