With one Grammy award win under her belt already tonight, Rihanna revealed her vulnerable side with an emotional performance of her new single, 'Stay,' which she sang with Mikky Ekko during the 55th Annual Grammy Awards.

Dressed in a slinky black gown that exposed just enough backside, RiRi went for a stripped-down set and showed off her vocal abilities. Whether you're a fan of bass-heavy club RiRi or this soft and unplugged Rihanna, there's no doubt she left it all out there on the stage.

"Not really sure how to feel about it / Something in the way you move / Makes me feel like I can't live without you / It takes me all the way / I want you to stay," are just some of the lyrics from 'Stay' that she sang.

Earlier this evening, Rihanna revealed details regarding the video for 'Stay,' which will premiere on the E! Network tomorrow night.

Watch Rihanna Perform 'Stay' at 2013 Grammy Awards