Christina Aguilera and her famous backup singers perform on The Voice.
Christina, Adam Levine, Pharrell and Blake Shelton joined forces for a surprise performance on “the biggest, most exciting night of the season” on The Voice last night, and there was even more star power to come. Ahead of the "battle rounds," the judges met with their special guest mentors, which included Patti LaBelle for Team Aguilera, Gwen Stefani will assist her new boyfriend Blake Shelton, Tori Kelly will lend Levine a helping hand and P. Diddy joined Pharrell. Before the contestants on the show got a chance to sing, the judges shared the spotlight with a brave rendition of Stevie Wonder’s “I Wish.” Naturally, it was all about Christina. Watch below: