Reese Witherspoon, Matthew McConaughey, and More Stars Sing "Wonderful Christmastime" A Cappella

Sing hits theaters on Dec. 21, and to celebrate the movie's upcoming release, Jimmy Fallon rounded up the film's cast, including Reese Witherspoon, Matthew McConaughey, Scarlett Johansson, and Seth MacFarlane, for an a cappella rendition of "Wonderful Christmastime" with The Roots and Paul McCartney. Yes, it's as amazing as it sounds! Check it out above now! Related:Matthew McConaughey Has the Support of His Beautiful Family at the Premiere of Sing