Rihanna performed on Saturday Night Live for the fourth time last night, and boy, was it odd. First she sang "Diamonds" (whose melodramatic video just came out) in front of a green screen, turning the background and the white t-shirts of her backing band into a freaky slideshow that looked like a '90s screensaver. Then she premiered her new ballad "Stay," wearing a clingy Bob Marley-print dress that would look good on no other woman on the planet...other than Rihanna, of course. Watch her SNL performances of "Diamonds" and "Stay" below. [Pigeons & Planes]