As far as we can guess there are two explanations for Rihanna's latest look:
1. The "Stay" singer is doing the Walk of Shame (or Stride of Pride according to that smile) after a very sexy night.
2. There was a fire alarm evac at the Barbadian beauty's hotel room right in the middle of her nap.
Though we guess there's a world in which the answer is a combo of options one and two...