Swift's rep, Tree Paine, tells PerezHilton.com:
Wow. Wow. Wow.
Kanye is straight-up INSANE!!!!!
One thing is for sure — it wasn't the worst!
And like … sure, some people would come out and just sing their latest song.
But not Usher. Usher brings it all to you. Usher brings the variety pack. Usher lays down his best songs all at once, including Confessions, U Remind Me, Love In This Club, U Don't Have To Call, Caught Up, and, of course, Good Kisser!
Prepare to love him even more than you already do! Ch-ch-check out the video (above)