This Jimmy Fallon & Billy Joel Doo-Wop Duet From The Tonight Show Is Too Cute For Words!

Is it just us, or is Jimmy Fallon having the most fun anyone has ever had on TV?
He’s had a beer with Annette Bening, sung with a frog, and pressed Hamm in tourists’ photos!
And now he’s dueting with music legend Billy Joel!
Ch-ch-check out the video (above) to see the duo duet to doo-wop!