Taylor Swift has done VERY well in LA, selling out all her shows and adding surprise guest cameos. She's sang duets with artists from other genres of music, like Justin Bieber and Nicki Minaj. The latest surprise, wasn't a singer at all, it was Ellen Degeneres. While Taylor sang, "Our Song", Ellen hung out on stage (she walked on saying she was looking for the ladies room, lol)! Watch it now, and catch it on The Ellen Degeneres Show that will air on September 14.