How the Stars Stay Slim

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Josh Duhamel and Fergie

For a great source of greens, this healthy couple turns to celeb nutritionist Kimberly Snyder's Glowing Green Smoothie. "I drink a glass of it every morning and it sends me off shooting into the day," Duhamel says.

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Sofia Vergara

For a speedy slimdown, the Modern Family actress does two-week stints of Freshology's meal-delivery service. The 1,100 to 1,350-calorie-per-day regimen provides lean meats, veggies, and whole grains. ($33 a day, freshology.com)

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Ashley Tisdale and Oprah Winfrey

When it comes to meal time, these two ladies are clock watchers. The Hellcats star won't indulge in carbs after 3 p.m., while the talk show host won't eat past 7:30 p.m. "It turned out to be one of the most effective changes I made," Winfrey said.

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Jessica Alba

Some may consider the 30-year-old actress lucky for sporting just a tiny baby bump during her second pregnancy, but she attributes it to her diet. "I try to eat organic with as many fresh foods as possible, and I avoid anything processed."

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Kathy Freston

"I eat vegan, so it's easy," the Quantum Wellness Cleanse author tells Us. "Vegan food has no cholesterol, is very low in fat, and naturally high in fiber, nutrients and protein. Vegan food burns 16 percent faster after a meal, so the weight just comes off naturally."

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Adrianna Lima

"I'm not into diets," the Victoria's Secret model confesses to Us. "But it's not easy to go to the gym everyday when I'm working, so I really watch what I eat: Three healthy meals a day, and no snacking in between! I get my protein, green vegetables, and I drink a lot of water."

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Rebecca Romijn

The Ugly Betty alum stays slim during the summer by eating light. "I try to eat lots of fruits and vegetables," she tells Us. "I tend to eat a lot of salad in general, but in the summer I really stick with that."

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Eva Longoria

The Desperate Housewives star's lean secret: Sunfare meal delivery, which consists of a balanced diet of carbs, fats, and protein. "It's great," she tells Us of the 1,200-calorie-per-day diet. (From $30 per day, sunfare.com)