Britney+Rihanna on one song is like PURE SEX! And when it's S&M, all about sex... Well, you get the idea.
No, seriously... It's amazing. Listen. Now.
Can you imagine if THESE TWO went on tour together?! I'd pee my pants.
I can settle for Nicki Minaj, though... Which is who will be opening for Britney all tour long. Heck. Yes.