It was actually recorded last year when the whole gang gathered together to shoot their annual Christmas card.
"We didn't have time to finish the whole song, but we thought we would put this out anyway!" Kim wrote on her blog today. "It was so much fun to make it... it's sort of become a tradition now to make family music videos."
Indeed. The Kardashians did a similar vid for Katy Perry's "E.T." last summer while vacationing in Bora Bora.