To get red carpet ready, Anne Hathaway turns to fitness trainer David Kirsch's LemonAid 48-Hour Detox Diet, while Gwyneth Paltrow chows down on salads and smoothies.

A-list couple Ashton Kutcher and Demi Moore started the Master Cleanse on Saturday, which consists of maple syrup, lemon juice, water and cayenne pepper. Nine hours into the cleanse, Kutcher posted on his Twitter, "I want a steak, a beer, and a blow-pop. Hmmm this is gonna be rough."

Check out what other celebs are doing to take off the pounds.

Celebrity Diets and Detoxes

Anne Hathaway

To get ready for a red carpet event Anne Hathaway uses David Kirsch's 48-Hour Detox. Prior to the 2009 Golden Globes she drank this four times a day for 48 hours.

Beyonce

In order to drop 20 pounds for her starring role in "Dreamgirls" Beyonce turned to the Master Cleanse, consisting of lemon juice, maple syrup and cayenne pepper. She gained the weight back right after filming.

Jennifer Aniston

Jennifer Aniston told the Huffington Post that she could never give up dairy or wine. Her advice to those trying to get in shape, "Just stop eating s* everyday," she said.

Leona Lewis

Last summer Leona Lewis did a month-long diet consisting of only vegetables and water.

Kim Kardashian

Kim Kardashian embraces her famous curves and is a spokeswoman for Quick Trim.

Whitney Port

After gaining 25 pounds in college, "City" star Whitney Port slimmed down to 115 by working out and cut out carbs, sugar and fried food.

Gwyneth Paltrow

When Gwyneth Paltrow decides to cleanse, she'll eat only salads and smoothies for weeks at a time.

Amanda Seyfried

Actress Amanda Seyfried has said it's difficult for her to remain thin.She says she works out like crazy and also will do a raw food cleanse, consisting of eating only spinach for lunch.

Megan Fox

"Transformers" star Megan Fox turns to apple-cider vinegar and water to cleanse her system.

Kathy Griffin

Comedian Kathy Griffin once joked that her secret is staying thin was "frustration and starvation."

Fergie

The Black Eyed Peas singer maintains a regular healthy diet and only allows herself one bite of dessert.

Jenny McCarthy

After giving birth to her son, Jenny McCarthy started Weight Watchers to drop the pounds.

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