Jessica Simpson, 39, Just Showed Off Her Toned Abs While Sunbathing On Instagram

Jessica Simpson , 39, soaked in some rays over the weekend, and she's never looked fitter. In her latest Instagram post, she shared a photo of herself in a bikini suntanning while laying on a float in the middle of her pooland her abs look super toned.

"Attempted gettin' some sun and my son smacked a homerun from the driveway that almost nailed me in the face. Proof is in the splash. Needless to say, I got off the mat ," she captioned her post.

Her personal trainer Harley Pasternak commented, "."

"BODY goals!," one fan wrote, while another commented, "You look amazing!!!! "

ICYDK, Jessica shared that she lost 100 pounds after giving birth to her third baby, Birdie Mae, with the help of her trainer, Harley Pasternak and Sydney Liebes .

Pasternak eased Jessica into activity slowly, starting with walking 6,000 steps daily. "Its a social thing that she can do with her kids," he explained. Slowly, she built up to 14,000 steps, according to E News .

And Liebes shared that Jess completed 45-minute workout sessions three days a week.

"You have worked your ass off and the reward is priceless!" Sydney shared in a congratulatory Instagram post. "Ive been training for 10 years now and I have never been more excited for a client transformation."

As for diet, Jessica followed Pasternak's Body Reset Diet , which allows for three meals and two snacks each day. Each meal includes protein, fiber, and fat, while snacks are a combo of protein and fiber or protein and fat.

And Jessica shared with People in July 2019, "I am eating healthy, tooI discovered I really like cauliflower. Who knew it could be a substitute for almost anything?!"