'The Voice' coaches Blake Shelton, Christina Aguilera, Blake Shelton, and Cee-Lo Green sing 'Start Me Up': Watch now!
The performance definitely helped squash any rumors that there's beef and feuding going on within the judges' circle -- everybody appeared to have a great time. (And we wouldn't have blamed Christina if she'd looked miserable -- there's no way that bustier was comfortable.)
The song set the tone for the season and reminded us of the standard to which "The Voice" coaches hold the contestants. They've got to be able to inspire and intrigue some of the best, most popular artists in the world, who defy genre and expectation. Check out a sneak peek at the performance below. Whose year is it?