Taylor Swift [1]'s good friend Ed Sheeran took to the stage with her ex John Mayer [2] at the Grammys [3] this year. To be honest, we don't really know how we feel about this, except that Sheeran looked adorable, as always. They sang "Thinking Out Loud," and Mayer does a pretty solid job on guitar duty. But oh, to be a fly on the fall when Sheeran told Swift he would be performing with Mayer — who she supposedly wrote "Dear John" about [4]. Check out the video below!

Ed Sheeran performing Thinking Out Loud at... [5] by abzzzmusic-vevo [6]