Stars’ Bikini Body Secrets

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Carrie Underwood

Since being crowned an American Idol in 2005, the engaged singer, 27, shed 20 pounds thanks to half-hour bike or treadmill workouts four to six days a week. Her favorite healthy snack? Kashi bars!

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Lauren Conrad

The self-admitted snacker, 24, munches on six small meals per day, totaling 1,500 calories. She also credits her personal trainer, Jarett Del Bene, for getting her in the gym three times a week. "I need someone in the gym making me do the extra five squats," she admits to Us.

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Jennifer Aniston

While shooting her comedy Just Go With It in Hawaii, the 41-year-old actress hit the treadmill or stairmaster for an hour daily. In between workouts, she sipped pureed papaya, pineapple and mango, and dined on veggies and fish. "I'm healthier," the size-2 Aniston has said of her body post-40.

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Kim Kardashian

"She's dedicated," says the reality star's trainer, Gunnar Peterson, who tightens her core with standing crunches and plank extensions five days a week. "It's hard," Kardashian, 29, tells Us of staying fit. "But I really see a difference."

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Melissa Rycroft Strickland

"I cut out salt, sugar and most carbs," Strickland, 27, tells Us of her no-nonsense diet. The Texas native is equally committed to her four-day-a-week home workouts. "Gyms intimidate me," she says. "It's easy to work out at home with the TV on!"

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Jessica Szohr

The sexy Gossip Girl star has a no-stress approach to healthy eating. "I watch what I eat during the week, and on weekends I kind of splurge," the 5-foot-5 actress, 25, admits to Us. "If you starve yourself, you'll go nuts."

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Cameron Diaz

How does the Shrek Forever After actress, 37, keep her legs looking lean and her tummy looking taut? "She stays committed to her exercise routine," her trainer Teddy Bass tells Us. "That way she can eat what she likes!"

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Cheryl Burke

After a slight weight gain in 2008, the 5-foot-4 dancer cut out red meat and cheese and swapped white carbs for whole-wheat bread. "I just feel more lean and toned," Burke tells Us. "I feel good and I look good."

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Kelly Ripa

The busy mom, 39, always makes sure to find time for a good workout. "I work out a lot," she tells Us of taking spinning classes at SoulCycle seven days a week. "I do one thing per day, and I rotate."

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Fergie

To lose the weight she gained for December's Nine, the Black Eyed Peas singer relied on 1,200-to 2,000-calorie-a-day meal deliveries from L.A. Diet Designs. "It was really fun putting it on, but it's been really hard getting it off," she tells Us. "I'm committed to being in shape."