Jennie Garth's Thinner Post-Split Figure: "She's Happier Than Ever"

Sources say Peter Facinelli's ex is "feeling good" after dropping an estimated 20 lbs.

Jennie Garth has undergone a post-breakup makeover, and she looks and feels fabulous!

After her 16-year relationship (including 11 years of marriage) with husband Peter Facinelli ended in March, the former Beverly Hills, 90210 star focused on herself, leading to a fairly dramatic weight loss.

Dr. Eric Braverman, author of The Younger (Thinner) You Diet, estimates to Us Weekly that the 40-year-old actress (pictured left in 2010, and right on Aug. 7) has lost 20 pounds in the last three months. And a source tells Us the slimmed-down star's waist size is now 25!

"She's happier than ever," an insider told Us. "She looks like the old Jennie!"

So how did she redefine her body?

"When you get sad, you either overeat or you become really healthy," a Garth pal explained. "Jennie's taking care of herself -- she's taken control of her situation."

A now single mother of three daughters -- Luca, 15, Lola, 9, and Fiona, 5 -- Garth is finally feeling confident.

"Before, she used to be like, 'OK, let's cover me up,'" the Garth source said. "And now she's more open-minded about having fun with her clothes. She's feeling good in her skin."

But when it comes to finding love again, the actress, who was spotted having dinner with HGTV star Antonio Ballatore in Las Vegas three months ago, isn't in a rush.

"She's been going on dates," says the insider. "She's not looking to get into anything too serious so fast."

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