Kristen Stewart, Nicholas Hoult and Scott Fahrendorf's ALS Challenge

Anne Hathaway challenged Kristen Stewart and she didn't back out of it!

"Hathaway, get this. This is a f--king real challenge," Stewart tells the camera before she, Nicholas Hoult and Scott Fahrendorf dunk their faces in buckets of dirty ice water - yes, bathroom water. At the end of the video, Kristen asked the viewers to "please be considerate of California water conservation."

The "Ice Bucket Challenge" which basically involves dumping a bucket of ice cold water on yourself or donate money to raise awareness for fighting ALS or more commonly known as Lou Gehrig's Disease (we bet they do BOTH). Hers is a somewhat creepy and silent rendition! She has an excellent poker face! (pun intended)