Hollywood's hottest stars weren't all born with perfect bodies nor are they immune to Ben & Jerry's 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 People Magazine reports that Brad Pitt and Friends co-stars Matt LeBlanc and Matthew Perry have also given it a try.

The Zone's prescribed diet 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.