Paul McCartney, Reese Witherspoon And More Join Jimmy Fallon For A Cappella Christmas Song

Jimmy Fallon is sharing a holiday flashback.

This week, ahead of Christmas, the “Tonight Show” Instagram account shared a video from the time Paul McCartney joined the Fallon, The Roots and the cast of the movie “Sing” for an a cappella take on his classic “Wonderful Christmastime”

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The video opens with McCartney and the Roots, and their then joined by Reese Witherspoon, Scarlett Johansson, Matthew McConaughey, Seth MacFarlane and Tori Kelly.

“The Tonight Show” originally aired the a cappella song for the Christmas season in 2016, back when “Sing” was released in theatres.

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Along with all the actors, the animated characters from the film also appear in the video.

Last week, Fallon joined James Corden for a Christmas musical performance featuring the Radio City Rockettes and a medley of holiday classics.