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Bill Gates, Demi Lovato, Justin Timberlake

Alberto E. Rodriguez/Getty Images, Scott Kirkland/FOX, CYVR/AKM-GSI

It's freezing. It's fun. It's a great cause that's soaking stars from coast to coast.

The Ice Bucket Challenge benefiting ALS has CEOs, wrestlers and stars like Demi Lovato, Justin Timberlake and so many more big names dumping buckets of ice water over their heads and challenging fellow famous faces to do the same or make a $100 donation to fight the disease with only a 24-hour window to get it done.

Joining Hollywood in its frosty philanthropy while upping the splash ante, Bill Gates constructed a device to perfect the icy pour and announced, "I'm always up for a challenge." He's now urged Ryan Seacrest and fellow tech tycoons Chris Anderson and Elon Musk to meet the arctic ultimatum.

Check out more media moguls and entertainers who have Barbara Newhouse, President and CEO of The ALS Association, saying, "We couldn't be more thrilled with the level of compassion, generosity and sense of humor that people are exhibiting as they take part in this impactful viral initiative."