Celebrities are jumping on the ice bucket challenge bandwagon to raise money for the Amyotrophic lateral sclerosis ( ALS ) Association.
Jennifer Lopez, Cara Delevingne, Suki Waterhouse, Iggy Azelia and Justin Timberlake are just a few A-listers to have completed the challenge - which basically involves pouring a bucket of ice water over your head.
The idea is that you accept the challenge, donate money to the charity and nominate friends to try it too. Nominees can either take it on or turn the offer down and donate more money.
Apparently Barrack Obama is the only public figure to have declined the challenge so far - but he did make a big contribution none the less. There was no stopping the likes of Mark Zuckerberg and Bill Gates though.
J-Lo did hers post work out, Iggy wisely did hers in her bikini and Cara's was followed by some shimmying action in what looks like a shower cubicle. Clever.
These are the best celeb #ALSiceBucketChallange videos we've seen so far...
And here's Mr JT doing his with The Tennessee Kids. Who did he nominate? Well he let his wife Jessica Biel off the hook and chose to land Jimmy Fallon in it instead.
Soaking yourself with ice water for a good cause is exactly the kind of social media craze we like to see doing the rounds.
On Sunday the ALS Association announced today that it has received $13.3 million (£7.9 million) in donations from over 250,000 people compared to $1.7 million (£1.1 million) during the same three week period last year (July 29 to August 17).
Game for the challenge? Do it and donate here.
For more funny videos check out these on MyDaily.