Rihanna on Matt Kemp: I'm Single!

Rihanna and Matt Kemp have certainly been having a good time of late. Just don't expect him to be there at Sunday's Grammys: "I'm going alone, as always!" she told Us. "Even when I was in a relationship, I always have gone alone." She then added, "I'm still single, if that's what you really want to ask!" Single? What about the trip to Dubai? Or all that frolicking Rihanna and Matt Kemp did in