There are several reasons celebrities might need waterproof makeup. They could be in the middle of a red carpet interview and end up caught in a thunderstorm. Their favorite ball team could win the title, causing them to be doused in Gatorade. They could get tossed into a tub of champagne with George Clooney (because that's surely what happens at those after-parties, right?).

More often than not, though, celebrities find themselves in need of waterproof makeup because they end up in tears for one reason or another -- check out our gallery for examples. And, to see how you can avoid a makeup disaster, check out StyleList's slideshow of waterproof makeup. You never know when you'll get tossed in a pool with gorgeous celebrities!