This should cheer you right up! The cast of "Sing" -- Matthew McConaughey, Reese Witherspoon, Scarlett Johansson, Seth MacFarlane, and Tori Kelly -- joined Jimmy Fallon, The Roots, and Sir Paul McCartney himself for a rousing rendition of "Wonderful Christmastime" last night on "The Tonight Show."

These "A Cappella" videos are becoming staples of Fallon's "Tonight Show," and this holiday version of McCartney's classic (complete with animated characters) is a welcome addition.

Check it out:Matthew McConaughey stars in "Sing" as the voice of koala Buster Moon, who produces a greatest singing competition to try and save his theater. McC was a main guest of last night's show, doing some Kid Theater (another Fallon classic) and sharing his holiday plans -- including a family trip to Brazil."Sing" opens Dec. 21, aka today, and McConaughey's other movie, "Gold," opens Christmas Day.

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Gold Movie Poster
Based on 40 critics

Kenny Wells, a prospector desperate for a lucky break, teams up with a similarly eager geologist and... Read More

Sing Movie Poster
Based on 37 critics

Dapper Koala Buster Moon presides over a once-grand theater that has fallen on hard times. An eternal... Read More

The Tonight Show Starring Jimmy Fallon TV Show Poster
The Tonight Show Starring Jimmy Fallon
NBCTV14February 17, 2014
Based on 19 critics

Each weeknight, Jimmy Fallon hosts A-list guests, alongside a topical monologue, fan-favorite games, signature comedy segments and today's popular music, all part of his... Read More