Rihanna and Matt Kemp are not a couple, she says. And can you please conveniently forget she used to say she and Chris Brown weren't a couple either? Anyway, RiRi went on the radio and when asked who she was taking to the Grammys proclaimed, "I'm going to the Grammys alone, as always. Even when I was in a relationship, I always have gone alone. I'm still single, if that's what you really want to ask." So what about the vacation with Matt Kemp in Cabo? "It was a blast," she replied.