Stephen Colbert

Stephen Colbert and Jimmy Fallon concluded a successful week-long project to raise $26,000 with a song-and-dance extravaganza on Friday. What did they sing? Rebecca Black's "Friday," of course.

The collaboration began when Colbert auctioned off a painting of himself, which raised $26,000 for DonorsChoose.org, and claimed that Fallon would be matching the donation. The only problem was that the late night host never promised anything of the kind. But the two agreed if Fallon could raise the money in a week, Colbert would sing "Friday" with The Roots live on Late Night.

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The new version of "Friday" has it all -- a heartfelt beginning, a rap interlude, Auto-Tune and even a few surprise guests.

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