Bradley Cooper [3] put on a brave face for the ALS ice bucket challenge on Friday. The actor withstood not one, but two big buckets of water without so much as a whimper. As for who had the honors of helping Bradley join the ranks of hot celebrity guys taking the challenge [4], one of the three participants appears to be none other than his girlfriend, model Suki Waterhouse. Check out Bradley's charitable moment above, and be sure to catch up on the best clips we've seen so far [5]!

Source: Getty/Cindy Ord [6]