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 makeup. "I could open a beauty supply store in my house," she says.

1995
Katherine Heigl's good looks were apparent even in her teen years.

2000
I love her look here....beach blonde waves....

2001
She looked more exotic as a brunette.

2004
She's back to blonde. "I can't style bangs but I love them!," she says.

2005
I just love her smile!

2007
She's totally glamorous as she turns up the heat on the red carpet with her old Hollywood style look.