Robert Pattinson  has officially joined the ranks of celebrities getting in on the ALS ice bucket challenge  fun, and it is everything you could have hoped for. Straying away from the expected, Rob treats us to what only can be described as a superhot wet t-shirt moment. (You can see his stomach!) Interestingly enough, the video popped up on pal Zac Efron 's YouTube channel on Wednesday, just one day after Zac nominated him. Watch the video for the first time below!