Katherine Heigl's Transformation

Katherine Heigl changes her look every time. The 28-year-old star who plays Dr. Izzie Stevens on Grey's Anatomy have been auburn, chocolate brown, and darker blond with big chunky streaks. But the Knocked Up lead is pretty low-key when it comes to styling her blond coif. "All I ever do is throw it in a bun so it doesn't turn into a big dreadlock," she says. Her simplicity wanes when it comes to