Watch: #JimmyFallon, #OneDirection, #ArianaGrande Sing 'We Are The Champions' A Capella

Jimmy Fallon and #TheRoots joined tons of celeb to sing an amazing a capella version of “We Are the Champions” on Sunday’s #TheTonightShow in honor of the #SuperBowl. The video features One Direction, #CarrieUnderwood, #SamSmith, Ariana Grande, #BlakeShelton, #Usher, #MeghanTrainor, and  #ChristinaAguilera. Watch below.