Katherine Heigl loves changing her look. "I've been auburn, chocolate brown, and darker blond with big chunky streaks," says the 28-year-old star, who plays Dr. Izzie Stevens on Grey's Anatomy. But when it comes to styling her blond coif, the Knocked Up lead is pretty low-key. "All I ever do is throw it in a bun." She keeps the long mane manageable by combing Kerastase conditioner in it daily "so it doesn't turn into a big dreadlock," she says. Where her simplicity wanes is with makeup. "I could open a beauty supply store in my house," she says. Friends have even asked her to do the makeup for their weddings. As her own nuptials approach (fiancé is musician Josh Kelly), it's nice to know she could fill in if the makeup artist is a no-show.

—Meg Hemphill

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