The postpartum bounce-back rate among celebs is incredibly fast, with models like Gisele and Heidi Klum winning the race. Six weeks after giving birth to her son Benjamin, Gisele was back to pre-baby shape, telling "Vogue" that she hadn't exercised much and saying, "I think it was muscle memory."

When asked what a "normal" amount of time to get back to your pre-baby figure would be, Erika Schwartz, MD, an expert in hormone therapy, starts with the ideal scenario: "Without complications during birth, if a woman follows a healthy diet, increases sleep to 8 hours a night, and gets exercise three to five times a week while breast feeding for an average of three months," she says, "it takes about eight months to a year." She also warns that if you don't take care of yourself, you may never get back into shape.

While Gisele may have literally bounced back into shape, many celebs turn to extreme workouts. Kate Hudson reportedly exercised three hours a day after her first baby, and Halle Berry worked with trainer Ramona Braganza, using the 321 Baby Bulge Be Gone method and putting in at least an hour a day.

Alicia Silverstone is just one of many enthusiastic vegans in Hollywood, and she gives her diet full credit for her appearance. But swapping turkey for tofu isn't necessarily the healthiest route for you. "You need to listen to your body," says Frank Lipman, MD, founder of Eleven-Eleven Wellness Center in NYC. "Some people do really well on a vegetarian diet, but some people just aren't meant to be vegetarians. If you're not feeling vital every morning -- your skin should look good, you shouldn't have bloating and fatigue -- then whatever diet you're on is probably not for you."

Beyoncé famously used the Master Cleanse to drop 20 pounds before filming "Dreamgirls." "I lived on water, cayenne pepper, and maple syrup for 14 days," she said. "It was tough; everyone was eating and I was dying." Gwyneth Paltrow and Naomi Watts have both professed their love for Organic Avenue juices. But it's important to know that not all juices are created equal. "Juicing is a great way to get nutrients into your body -- but drink green juices," says Lipman. "A lot of the juices are too sugary." Fruit-based juices can actually cause you to gain weight, and Beyoncé's Master Cleanse juice had hardly any nutrients at all -- not exactly a healthy way to lose weight.

Demi Moore told David Letterman in 2008: "I was in Austria doing a cleanse and part of the treatment was leech therapy. These aren't just swamp leeches though -- we are talking about highly trained medical leeches." She went on to say how fantastic she felt, explaining that the leeches had "cleaned her blood." But if you're looking for a new, effective way to cleanse, this probably isn't it. "It's an old Asian remedy, and it's not really detoxing," says Lipman. "It may work on a small part of the detox system, but you need to support the liver and the gut for a true detox." Lipman advocates the Be Well Cleanse, a combination of supplements and probiotic shakes that also incorporates two small meals a day, and ditching the water parasites.

Heather Graham recently told "People" that she needs 11 to 12 hours of sleep every night to look her best. While most doctors agree that a good night's sleep is necessary for your health, there's no "more is always better" rule. "Everyone needs different amounts of sleep," says Lipman. "Some people need six hours, some people need eight hours -- 12 hours is a little much. Usually between six and nine is right." A study conducted by the Sleep, Health, and Society program at the University of Warwick -- which analyzed data on 1.5 million people -- confirmed that both too little and too much sleep can be harmful, and even lead to premature death.