Colbie Caillat & Fall Out Boy's Patrick Stump will also appear in star-studded season.
How many guest mentors can a season of The Voice entertain?
At the beginning of Tuesday night's (Nov. 18) episode, Carson Daly announced that even more star power will appear on the show next week: Diana Ross, Colbie Caillat, Meghan Trainor and Patrick Stump of Fall Out Boy.