'Project Runway' host Heidi Klum and former Spice Girls singer Mel B join the judges panel for the eighth season of 'America's Got Talent,' alongside Howie Mandel and Howard Stern. A preview released by the network shows the new judges in action, along with some of the crazy variety acts in the upcoming season including singers, dancers, snake charmers, and animal acts. Kristina Behr has the details.