Jennie Garth toned up for her comeback role on the new 90210 by working out five days a week with husband actor Peter Facinelli to trainer Tony Horton’s P90X DVDs. “Every day is different,” she says. “One day is really hard yoga. Then arms and shoulders, legs, then karate. His program is made to confuse the muscles so you don’t plateau. I feel better now than I ever have.”

Brooke Shields wore the same pair of jeans she modeled in Calvin Klein ads 28 years ago at a recent bash for the designer’s 40th anniversary. So, how does she stay so fit? “If I stay away from too much carbohydrates, I’m usually better off,” says the 43-year-old mom of two, who also does spinning and yoga. Though whole grains and brown rice are on her menu, Shields doesn’t “believe in denying myself. I don’t want to go through life not enjoying.”

She plays an intense publicist on HBO’s Entourage, but when it comes to her diet, Debi Mazar is much more relaxed. “I believe in balance, nothing too radical,” says Mazar, who hosts UnderTheTuscanGun.com, an online cooking show with husband Gabriele Corcos that focuses on fresh, healthy Tuscan recipes. “I love food, and I love culture. Food is a celebration, so I think when you eat well-balanced, that’s the key.”

Source: People.com (Health section)

According to ‘Shape Magazine’, Grammy-winning vegetarian Carrie Underwood has dropped between 15 and 20 pounds since her American Idol days. How did she do that? By hitting the treadmill, swimming and sticking to healthy foods. Although she admits to a weakness for cheese, Carrie prevents herself from overindulging by keeping a food diary and carrying around whole grain Kashi bars wherever she goes. Nice trick gurl!

As for Kelly Clarkson, the original queen of AI, she does not reportedly believe in diets. However, being in the music business forced her to refined her eating habits (focusing on portion control) and amping up her fitness routine instead of following any particular diet plan. Kelly has told ‘Us Weekly’ that she indulges in her penchant for chocolate, but only to a certain point.

After a five-year battle with bulimia, AI season 5 runner-up Katherine McPhee managed to drop 30 pounds the healthy way by sticking to the Intuitive eating plan. She told Shape Magazine that the plan worked because she can munch on anything she pleases, but when she’s full, she stops. Exercise-wise, Katherine tones her muscles with weight training and likes to walk on the treadmill for 45 minutes four to five days a week.

1. Boiled Egg Only Diet – During the filming of “Cold Mountain,” there were rumors that one famous actress on set ate only boiled eggs. She would rise in the morning and eat one and then have one or two at the end of the day. That was her entire diet! Could this be Renee Zellweger??

2. Red Bull Diet – Who else epitomizes this but Paris Hilton! The heiress caused a stir when she walked into New York restaurant Nobu recently and told the waiter her order of “Mineral water.” Over the course of her two-hour “meal,” Paris only took sips of water and Red Bull – she didn’t eat a single bite o_O

3. Master Cleanse / Lemonade Diet – Water mixed with maple syrup, lemon juice and cayenne pepper. Beyoncé admitted following this regimen for two weeks to drop 20 pounds for the film “Dreamgirls.” Jared Leto used it to shed about 30 pounds he gained to play Mark Chapman in the new film “Chapter 27.”

4. IV Diet – Celebrities check in to the hospital to get put on an IV (intravenous) so they can avoid eating altogether.

5. Dieter’s Tea Diet – In reality, it is a mild laxative and some stars drink up to 10 cups a day. One Hollywood trainer says: “The latest trend among models is mixing laxative tea with the Master Cleanse diet. All they drink is Master Cleanse and laxative tea.”

Lose excess weight over the weekend for that special event!

Cameron Diaz is not one of those stars who skip breakfast (especially the next day after exercising).

After a hard workout at the Gym on Nemo in West Hollywood, the athletic actress was spotted ordering a big burrito and a full fat latte for breakfast the following day. This only proves that she knows how to balance things in life!

Photo credit: Anthony Dixon / WENN

Halle Berry got back into shape just two months after giving birth to her first child. Apparently, her secret to losing her pregnancy pounds is just eating healthy and exercising (and probably being in love too, as she just got engaged to her boyfriend and baby-daddy Gabriel Aubry).

In terms of diet, Berry is eating lots of vegetables, lean proteins and complex carbohydrates, as well as drinking a large quantity of water.

The 41-year-old actress also works out for 60 minutes, five days a week with celebrity trainer Ramona Braganza.

Their sessions include three cardio segments – on the elliptical, as well as kickboxing and then a stairs or hill climb – then also does a strength-training routine that include abdominal work and leg exercises. [Source]

Here are some pictures of Halle at the 15th Annual EIF Revlon Run/Walk for Women in Los Angeles last week.

Photo credit: Jody Cortes / WENN