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Niki Taylor

The supermodel and former Celebrity Apprentice contestant gave birth to her third child in 2009. Over the next 13 months, she lost 59 pounds by eating healthfully—oatmeal sprinkled with berries and chicken broiled in coconut oil were two of her post-pregnancy staples—and exercising at least 30 minutes a day. "If I have dessert, I spend half an hour more exercising," Taylor told People in May, 2010.

Next: Jennifer Garner