Hollywood's hottest stars weren't all born with perfect bodies nor are they immune to ice cream binges - but you'd never know it watching their svelte bods saunter down the red carpet. How do they manage to look so amazing? Some work out with personal trainers, some visit the plastic surgeon - but all celebs watch what they eat. And because stars have sparked some of the most enduring diet trends, we're watching them. Here's the inside scoop on who's eating (and not eating) what.

Low-Carb
Cutting carbs is the biggest weight loss trend in Hollywood these days and the Zone is the low-carb 'it' diet. Jennifer Aniston dropped 30 pounds on the high-protein plan and it was reported that hubby Brad Pitt and Friends co-stars Matt LeBlanc and Matthew Perry, have also given it a try.

The Zone's prescribed quota of 40 percent carbohydrates, 30 percent protein and 30 percent unsaturated fats works for Renee Zellweger, too, who slimmed down on the plan after gaining 20 pounds for her role in Bridget Jones's Diary. The diet has also attracted sleek celeb followers like Madonna, Cindy Crawford, Winona Ryder, Demi Moore, Kristin Davis and Kirstie Alley, to name a few.

Another popular low-carb choice is the high-fat Atkins diet. The meat-and-cheese-heavy plan reportedly helped Catherine Zeta-Jones lose her post-pregnancy pudge.

And according to unconfirmed Hollywood rumours, Sharon Stone and Tori Spelling have given the low-carb Sugar Busters diet a try. The doctor-created plan says cutting all forms of sugar is the secret to losing weight.

Low-Fat
It may seem like everyone in Hollywood is running from the breadbasket, but some stars are focusing less on carbs and more on fat. Fran Drescher's diet of choice is the low-fat Weight Watchers plan. Weight Watchers serves up balanced meals based on a point system where every food is assigned a number of points based on its fat, fibre and calorie content. The programme slimmed down Sarah Ferguson who went from a size 14 to a size 10 on the plan. The Duchess now preaches what she practices as Weight Watchers' spokeswoman.

Organic
For other stars, organic foods are the answer. Gwyneth Paltrow follows a strict macrobiotic diet that bans all meats, eggs, dairy and caffeine. 'It's hard to do,' she told reporters in 2000, 'but it's very worth it. I try to eat as organically as possible. I don't eat candy, because I don't think there's any prana, any energy, in it. I try not to eat anything that's toxic.'

Julia Roberts and Christina Aguilera have gone organic, too. Thesmokinggun.com reports that Roberts insists on having organic milk in her trailer and Aquilera keeps organic milk and soy cheese in her dressing room.

Vegetarian
Vegans Alicia Silverstone and Drew Barrymore avoid all animal products and, instead, stick to foods like peas, beans, lentils, peanuts and almonds to get protein.

And size two Cameron Diaz isn't counting calories. 'I'm blessed with a quick metabolism, so I can eat more or less what I like,' the former Charlie's Angel boasted. But before dieters across the world start sending her hate mail, Diaz does admit that she's a vegetarian and recently gave up caffeine.