FINAL FOUR ACTS COMPETE LIVE ONE LAST TIME - The final four acts perform live in Hollywood one last time for a chance at the $1 million prize and a headlining show in Las Vegas. Sharon Osbourne, Howie Mandel and Piers Morgan star as the celebrity panel of judges. Nick Cannon hosts. Performing tonight... Fighting Gravity - Blacksburg, Virginia (Performance Artists) Jackie Evancho, Pittsburgh, Pennsylvania (Singer) Michael Grimm - Waveland, MS (Musician/Singer) Prince Poppycock - Los Angeles, California (Opera Singer)