Okay, late nighters, tonight on Saturday Night Live, SNL, there are going to be musical performances by the singer Rihanna. So not only will you be able to enjoy a few laughs, but you'll also be fixated in a groove. She'll be dancing up a storm with some tracks laced throughout the show. Now, if only they could have Rihanna perform a duet with either Alicia Keys, Gwen Stefani, or Ciara Harris: That would really charge the atmosphere!