Susan BoyleShe wasn't even a competitor on the show, but Susan Boyle arguably stole the finale of 'America's Got Talent' Wednesday night. Making her U.S. television singing debut, Boyle sang a version of the Rolling Stones' song 'Wild Horses' and even spoke briefly about her hospitalization following her loss on 'Britain's Got Talent.'

"I've never felt so tired. I look back at it now and it was a necessity because I was tired... I used to be a spectator looking out at the world, but now I'm part of that world,"Boyle said. Watch her U.S. debut: