PICTURE: Jessica Simpson Shows Off 60-Pound Weight Loss While Leaving the Gym

Work it out, Jess!

Jessica Simpson showed off her slim, toned legs in Los Angeles Thursday, Oct. 25 while leaving the gym. The new mom styled short, black shorts, a gray Yale sweatshirt and big shades after her workout.

With the help of Weight Watchers PointsPlus program and four-times-a-week training sessions with celebrity trainer Harley Pasternak, Simpson, 32, has already lost 60 of the 70 pounds she gained during pregnancy.

Since welcoming daughter Maxwell Drew six months ago with fiance Eric Johnson, the first-time mom has slowly been losing the baby weight. "She's so focused and determined," her Weight Watchers leader Liz Josefsberg tells the new issue of Us Weekly, out now. "She's very brave to do this in a healthy, more realistic way."

Although Simpson was all smiles Thursday, her parents Joe and Tina Simpson confirmed to Us Wednesday that they filed for divorce late last month after 34 years of marriage.

"It is an amicable split and there is no third party involved. Any other related allegations are completely false," a family rep told Us. "The family appreciates your respect for their privacy at this time."

Meanwhile, for all of the details on Simpson's body struggle, her daily diet, workout techniques -- and how she fights the haters! -- pick up the new Us Weekly, on stands Friday, Oct. 26.

Via: PICTURE: Jessica Simpson Shows Off 60-Pound Weight Loss While Leaving the Gym