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Katherine Heigl

Katherine Heigl may have won our hearts as the very smart (and very blond) Dr. Izzie Stevens on Grey's Anatomy, but the actress has since experiment with strawberry blond, rich auburn and now a bold espresso shade. “At her request, I took Katherine a deep rich chocolate brown. It's the darkest she’s ever been, and she loves it," said her colorist Kim Vo.

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