From Justin Bieber to Elisha Cutherbert, some big names have been taking part in the ALS Ice Bucket Challenge, the latest social media trend to raise as much money as possible for the research and treatment of the amyotrophic lateral sclerosis (ALS), a motor neurone disease.
The challenge involves filling a bucket with ice cold water, and then pouring it over yourself, all while being videoed as hilarious proof for friends and social media followers. The drenched participant must then nominate three more people to experience the gruelling ice shower.
I Knew You Were Trouble singer Taylor Swift, 24, completed the challenge alongside American actress Jaime King and a few friends. The blonde duo donated hundreds of dollars on behalf of the whole group, and Taylor then went on to nominate Selena Gomez, Emma Stone and Ed Sheeran.
Taking on Ryan Seacrest and Taylor Swift's nomination, 22-year-old Selena Gomez squealed as she was covered in ice cold water on her terrace at home. She then went on to nominate model friends Cara Delevingne and Suki Waterhouse as well as "James Franco...because my shirt says James Franco".
A shirtless Justin Bieber, 20, completed his second ice challenge with a considerably larger bucket. Having previously nominated Ellen DeGeneres and US President Barack Obama, the Baby singer passed the challenge on this time to his loyal fans, his "Beliebers".
Microsoft founder Bill Gates went one step further, creating a contraption to pour the bucket of ice water over himself. The technology billionaire was more than happy to accept his nomination from Facebook founder Mark Zuckerberg.
Pop diva J-Lo is one of the latest celebrities to accept the charity challenge, showing off her perfectly toned abs in the process.
Chloë Moretz,17, completed the challenge with ease, before jumping into her swimming pool nearby.
The Fault in Our Stars actor Ansel Elgort, 20, also completed his nomination and donated $500 to charity. He captioned the video on his Instagram page, "I may scream like a girl at the end, but I donated like a man!!!", following his drenching.
One of the most famous Americans to take part in the charity phenomenon was chat show host Oprah Winfrey, who was filmed filling her bucket with ice cubes, and then screaming continuously following the shower. Oprah went on to nominate award-winning actress Helen Mirren.
Canadian actress Elisha Cuthbert and her NHL player husband, Dion Phaneuf, did a duo challenge, in which Elisha called out Olympic gold medalist (and fellow Most Beautiful Star) Tessa Virtue!