Watch Jimmy Fallon Promise Stephen Colbert Will Perform Rebecca Black's "Friday

By:OK! Staff

March 29 2011, Published 11:37 a.m. ET

Today is Tuesday, tomorrow is Wednesday, then it's Thursday and after that is Friday, the day Jimmy Fallon needs raise $26,000 from fans to get Stephen Colbert to sing Rebecca Black's "Friday" on his show!

OK! VIDEO: WATCH JIMMY FALLON & STEPHEN COLBERT DUKE IT OUT OVER ICE CREAM

It was started when Jimmy's BFFSM (Best Friend For Six Months) Stephen, announced his show that Jimmy was matching a $26,000 donation to DonorsChoose.org. Unfortunately, Jimmy never said he'd do that, so Stephen came on Late Night With Jimmy Fallon to confront him.

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“If you can’t donate $26,000 of your best friend’s money without asking him first, then what’s the point of being Best Friends?” Stephen asked (via Entertainment Weekly). “I give, I give, and I give … your money … to other people. And I get nothing back.”

So Jimmy came up with a solution.

“If we can raise $26,000 by this Friday, I will promise that my BFF for Six Months, Stephen Colbert, will come on this show and sing Rebecca Black’s ‘Friday’ with The Roots,” Jimmy said. “And that is a promise that I am making … from him … to you.”