THEN: The 12-year-old star of 1998's The Parent Trap vowed, "I don't want fame to change me." NOW: Her hair color, at least, has changed – several times. But the natural redhead remains "an absolute knockout," says her hairstylist, Peter Butler. And those party-girl rumors? Lohan, 19, insists: "I have a younger sister, and I want to set a good example."