If Sunday night is music's biggest night, then today is music's biggest day -- it's Ellen's Grammy Show! Ellen will celebrate the best in music all show long. Joining Ellen will be Grammy winner RIHANNA. She's back stronger than ever with her latest album, "Rated R." Rihanna will chat with Ellen and sing one of her latest songs and a favorite hit -- it's a performance you can't miss! Ellen will also have the greatest highlights directly from the Grammy red carpet... and you never know what other surprises she's planning!