Extreme Celeb Diets

To shed some major pounds for her role in "Dreamgirls," Beyonce relied on the Maple Syrup Diet and shed 22 pounds in only 14 days. The diet consists of consuming nothing more than water, cayenne pepper, and maple syrup. Yikes! (AP)

Matt Damon shed 45 pounds for play a heroin-addicted soldier in "Courage Under Fire" - by running 10 miles a day and adhering to a strict diet of egg whites, chicken, vegetables and dry baked potatoes. The extreme diet took a toll on his health however and induced an adrenal gland disorder which made him extremely sick. (AP)

Gwyneth Paltrow famously abides by a very strict Macrobiotic diet, which prohibits processed foods and allows very little dairy, eggs, poultry, and meat. She's also a fan of detox cleanses to shed extra pounds fast. (AP)

When Molly Sims wants to lose weight fast, she visits the We Care Spa in Desert Hot Springs, California, where clients are restricted to eating only 400 calories per day, must down massive quantities of wheat grass, and are administered regular colonics. (AP)

In addition to her rigorous fitness regimen, Madonna adheres to an extremely restrictive macrobiotic diet which is low in fat, high in fiber and rich in vegetables and soy. (AP)

Jared Leto turned to the Master Cleanse - which involves drinking only lemonade made from fresh lemon or lime juice, maple syrup, water and Cayenne pepper - to shed the 62 pounds he gained to play Mark Chapman in the film Chapter 27 (AP)

Brooke Shields relies on the Grapefruit Diet to stay slim. The diet restricts calorie intake to 800 per day and allows you to eat little more than grapefruits. (AP)

In an attempt to shed 20 pounds for her role in as a spy in the film "Salt," the Angelina Jolie turned to Martha's Vineyard Detox Diet, in which you ingest liquids every two hours to cleanse the body. But the diet isn't without some serious side effects -- it reportedly caused the star to faint while on set! (AP)

Julianne Moore maintains her svelte physique with a super strict diet. The actress has said: "I still battle with my deeply boring diet of, essentially, yogurt, breakfast cereal and granola bars. I hate dieting. I hate having to do it to be the 'right' size. All actresses are hungry all the time, I think." (AP)

For her role in "The Devil Wears Prada," Anne Hathaway stuck to a diet of nothing more than fish, vegetables, and fruit. The actress confessed "Emily Blunt and I would clutch at each other and cry because we were so hungry." (AP)