Mean Girls was one of the biggest surprise hits of 2004. It rightfully launched several careers into orbit. Some of the cast are huge stars today. Some became stars but faded away. And others have yet to make it really big. But in a movie full of colorful characters, just about every member of the ensemble is memorable in this movie. So take a look back and this '00s classic teen movie. Check out the Mean Girls cast then and now, and see how much things change.