Britney Spears [1] is the latest star to take part in the ALS Ice Bucket Challenge [2], and her reaction to getting dumped with freezing cold water is priceless. The singer was nominated by her younger sister, Jamie Lynn Spears [3], and dutifully took up the challenge on Instagram. Despite the fact that we've seen dozens of stars take on the ice, Britney appeared to be more than a little surprised when she got dumped. Check out her nearly non-family-friendly response above, and don't forget to check out the best Ice Bucket Challenges so far [4]! (Oh, and she nominated Adam Sandler [5], so keep an eye out for that one!)