Kristen Stewart, Nicholas Hoult and Victoria Beckham are among the latest stars to take part in the Ice Bucket challenge.
The craze involves tipping a bucket of icy water over your head to raise awareness for ALS, the US charity that supports research into motor neurone disease.
Equals co-stars Kristen and Nicholas took it a step further by dunking their faces in the ice bucket for 15 seconds as well as having the freezing water tipped over them.
Twilight star Kristen was nominated by Anne Hathaway and addressed the actress as she got dunked, saying: "Hathaway, get this - this is a f***ing real challenge!"
At the end of the video she flashes a peace sign and tells fans: "In good faith you must believe that all of this was done with dirty bath water. Please be considerate of California water conservation."
Victoria Beckham took part a few days after her husband David stepped up to the challenge, and the footballer was on hand with their three sons to tip the bucket over her head.
The video shows Posh kneeling down while the rest of her family tip two silver buckets of freezing water over her.
She has now nominated Tom Ford, Katie Holmes and her son Cruz to take part.
Other stars who have taken part so far include Tom Cruise, Robert Pattinson, Oprah Winfrey, Simon Cowell, Gwyneth Paltrow, Justin Bieber, Will Smith, Dave Grohl, Sarah Jessica Parker and Lindsay Lohan.
One star who won't be joining in is Pamela Anderson, who posted a message on Facebook explaining why she wouldn't be dousing herself for charity.
The former Baywatch actress, a keen animal welfare supporter, wrote: "Sorry - I can't bring myself to do your Ice bucket challenge. I enjoy a good dare - It's always good to bring awareness - in fun, creative ways / I don't want to take away from that. but it had me thinking. Digging a bit deeper. I found that we may not be aligned - in our messages. So... - I thought Instead / I'd challenge ALS to stop Animal testing."
She concludes by saying: "Please, help scientists make real progress toward treating and curing human diseases by visiting HumaneSeal.org to find and support charities that never harm animals and which pour their time and resources into advanced, promising, human-relevant cures."