From PEOPLE Magazine Click to enlarge
STUCK TO A TWO-WEEK LIQUID FAST

Beyoncé Knowles

HER DETOX PLAN: MASTER CLEANSE
To drop 20 lbs. for her Dreamgirls role, Beyoncé lived off the Master Cleanse concoction of hot water, lemon juice, maple syrup and cayenne pepper. "I was very hungry, therefore I was evil," Beyoncé said on The Ellen DeGeneres Show in '06. "When we wrapped the movie I was so excited....I ate a whole dozen Krispy Kreme donuts."

ONLY LEMONADE FOR TWO DAYS

ANNE HATHAWAY

HER DETOX PLAN: DAVID KIRSCH'S 48-HOUR DETOX
As a client of N.Y.C.-based trainer David Kirsch, Hathaway occasionally does his 48-Hour Detox, which involves ingesting his LemonAid (a concentrate of lemon, maple syrup and cayenne pepper) four times a day—and nothing else! It helps "to lighten it up a little bit," says Kirsch, adding that she did it before January's Golden Globe Awards. "Her arms were so well-sculpted, she wore a sleeveless dress that night."

CONSULTED WITH A SPECIALIST

GWYNETH PALTROW

HER DETOX PLAN: In January Paltrow blogged that she needed "to lose a few pounds of holiday excess." A cleansing vet ("I like to do fasts and detoxes a couple of times during the year," she wrote), Paltrow devised a weeklong diet plan with detox specialist Dr. Alejandro Junger. Along with drinking beet-carrot-apple-ginger juice (right), the star also cut out dairy, caffeine and processed foods—and amped up her willpower. Wrote Paltrow: "I will be suffering along with you to kick-start my year a bit lighter."

Sugar- and soy-free teriyaki chicken

Broccoli and arugula soup

DRANK FOUR CUPS OF TEA A DAY

GIULIANA RANCIC

HER DETOX PLAN: THE ULTIMATE TEA DIET
This "mild cleanse" not only helps the E! News anchor stay slim during awards season, it also helped her drop 7 lbs. the month before her '07 wedding to Apprentice champ Bill Rancic. By drinking four cups of the tea daily along with three light meals such as chicken breast with steamed veggies, "my skin started looking younger, and I had more energy than ever."

EVEN TWENTYSOMETHINGS CLEANSE!

JESSICA SZOHR & MEGAN FOX

THEIR DETOX PLANS: Fox, 22, has said that because of her "really big sweet tooth," she'll sometimes cleanse with a combo of apple-cider vinegar and water, claiming, "It cleans out your system." And Gossip Girl's Szohr, 23, recently spent 2 1/2 days on the Blueprint Cleanse, which consists of raw juices (maxing out at 1,200 calories a day). Says Szohr: "It makes you feel really refreshed."

ARE THESE DETOX DIETS SAFE?

Not surprisingly, doctors advise against all-liquid diets because they provide so few calories and nutrients, you run the risk of everything from fainting spells to dehydration. As for claims that such plans flush out your system? "Ridiculous," says weight-loss doctor Jana Klauer, M.D. "Our liver and kidneys take care of that just fine." Moreover, by cutting protein from your diet, you lose muscle mass, which may lead to short-term weight loss but also ends up slowing your metabolism. Your best bet if you simply must have quick results: a detox plan that includes some real foods, like fruits, veggies and whole grains.