Hosted by Nick Cannon and presided over by the explosive combination of celebrity judges David Hasselhoff, Sharon Osbourne and Piers Morgan, America's Got Talent brings the variety format back to the forefront of American culture by showcasing performers from across the country. The series is a true celebration of the American spirit featuring a colorful array of hopeful stars, including singers, dancers, comedians, contortionists, impressionists, jugglers, magicians and ventriloquists, all vying for their chance to strut and perform on stage hoping to win America's hearts -- and the million dollar prize. The two-hour fourth season premiere kicks off with auditions shot on-location in theaters across the nation.