Liam had teased his challenge video was coming, tweeting: "Just found out I've been nominated for this ice challenge thingy I accept your challenge mrs Cheryl"
Liam accepted the challenge from Cheryl Cole and passed it along to his girlfriend, Sophia Smith, Pharrell Williams, and comedy heavyweights Will Ferrell and John C. Reilly, who co-starred in Step Brothers.
Liam shared the video on Instagram, writing: "Thank you everyone please remember the most important thing is donating so please donate at http://www.alsa.org"
The caption for his video? "Ice ice baby donate at http://www.alsa.org thanks girls." No doubt it was the thrill of a lifetime for those lucky fans!
Of course, we're still waiting for Louis Tomlinson to take the challenge after his nomination from Niall Horan, as well as Harry Styles taking the plunge after pal Zac Braff nominated him. And what about Zayn Malik? Get on it!
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Gallery | Celebs Who Have Accepted the ALS Ice Bucket Challenge