Justin Timberlake Accepts #StrikeOutALS Challenge from Boston Marathon Bombing Survivors

Watch the singer pour ice water over his head and find out who he challenged!

— -- Odds are, your friends have posted videos of themselves to Facebook that depict them dumping buckets of ice water over their heads as part of the #ALSIceBucketChallenge.

Now you can add Justin Timberlake to that list.

The singer accepted a nomination from Patrick Downes and Jessica Kensky, two survivors of the Boston Marathon bombing, and challenged Jimmy Fallon and the Roots to follow suit.

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"You've got 24 hours to donate AT LEAST $100 or douse yourself with ice," he wrote to his celeb pals. "Or both. We did both...and then we donated a bunch more. It's such a good cause. To donate: http://alsa.org/donate/."

To watch Timberlake and members of his back-up band, the Tennessee Kids, go through with the deed, watch the video below.