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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)

In the last issue of Us Weekly magazine, many stars shared their diet and fitness secrets that helped them lose weight and tone up.

Continue reading for Lauren Conrad, LeAnn Rimes and many other celebrities‘ diet tips, as well as some before & after photos.

Photo source: Usmagazine

More pictures of celebrities before and after losing weight…

Rachel Hunter, who partnered with Slim-Fast to help launch their new diet campaign, hosted the “Style Your Slim” fashion show in Hollywood yesterday (January 8).

Some of the celebrities (they were of all sizes!) that attended this event are Kim Kardashian, Stacy Keibler, Jaime Pressly, Jennie Garth, Elise Neal and Chyna. More pictures after the jump!

You can get a free Slim-Fast “Style Your Slim” starter kit here!

Photo source: All Access Photo Agency

More celebrity pictures at the “style Your Slim” event

It looks like “Dancing with the Stars” is helping many celebrities lose weight and get back into shape! Jane Seymour recently confessed she lost 22 pounds while on the show, and now it’s Jennie Garth’s turn to talk about how the contest helped her slim down.

Jennie Garth’s slimming down secret is not what you might think. “I eat a lot now,” the Dancing with the Stars contestant tells Us Weekly. “I love a late-night Dorito.”

The 35-year-old mom of three (Luca, 10, Lola, 4, and Fiona, 1) has found the alternative to dieting: “Rehearsing for six hours.”

Garth tells Us, “When I decided to do [Dancing with the Stars], I did pilates three days a week and cardio twice. I hated it, but it helped. Once I started dancing, things changed faster than when I was just working out.”

Garth says she’s dropped 10 pounds since starting on the show, “but it’s more about the inches and toning. My jeans were a 29 when I started, and I’m wearing a 27 now,” she explains. “It’s great to be able to go to the back of my closet and get the clothes I wore [prebaby].” [Source]

A few candid pictures of Jennie Garth in LA…