America's Got Talent will celebrate the holidays with the festive, star-studded America's Got Talent: Holiday Spectacular, featuring this season's winner Grace VanderWaal, along with fan favorites The Clairvoyants, Brian Justin Crum and the Olate Dogs, special guests Penn & Teller and suave crooner Sal Valentinetti, who performs a festive "Santa Baby" with Heidi Klum. Additional performances include Season 5 phenom Jackie Evancho, Season 9 winner Mat Franco, The Regurgitator and daredevil Professor Splash, who will perform a seasonally appropriate dive into a pool of eggnog. Nick Cannon hosts with Mel B, Klum, Simon Cowell and Howie Mandel joining in on the fun.