The Muppets are no stranger to Late Night With Jimmy Fallonthey've made 13 appearances on the show since 2009, including a few Christmas-themed singalongs. Last night, Kermit and Robin (Kermit's nephew) showed up to sing "When The River Meets The Sea," a sweet little tune from the John Denver/The Muppets '70s album, with Fallon and The Roots. Watch it below!

Below, you can listen to the original John Denver-sung version of the song. And below that, you can watch a short clip of Fallon and The Muppets singing a seemingly impromptu version of Harry Nilsson's classic "One."