What...he changed his hat and added a fake mustache!
I got this from the very funny girls at Go Fug Yourself. They have a gallery of celeb costumes here. Unfortunately they do not have Heidi Klum's latest. You can find that here.
I tried to find a picture with a higher resolution but you know what you get when you do an image search using "slash" and "costume"? Gore. That's what. Or this: