Get ready for the ultimate snack-down when Gordon Ramsay and Christina Tosi invite celebrities into the MASTERCHEF kitchen to show off their culinary skills in head-to-head contests for charity. Competitors include Trai Byers and Grace Gealey Byers; Nene and Gregg Leakes; Cheryl Hines; Kal Penn; Ronde Barber and Tiki Barber; and Joel Madden and Benji Madden. MASTERCHEF CELEBRITY SHOWDOWN premieres Monday, Jan. 2 at 8/7c on FOX.