Jessica Simpson shows off jaw-dropping lifestyle change

Jessica Simpson has admitted she weighed 108kg during her pregnancy, and now the star has stunned fans with her slim photo. Photo / Supplied

Jessica Simpson has proved she's made the most of lockdown.

The fashion designer posted a picture of herself on Monday doing a warrior yoga pose in workout clothes from her Jessica Simpson Collection, after she admitted she gained 45kg during her pregnancy.

"Starting the week with a warrior mindset aligned with the beauty of the sunset," she captioned the photo.

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Starting the week with a warrior mindset aligned with the beauty of the sunset ✨

A post shared by Jessica Simpson (@jessicasimpson) on Sep 28, 2020 at 4:55pm PDT

Earlier this year the singer and mum of three showed off her dramatic weight loss on Instagram, posting a mirror selfie while wearing bike shorts and a sports bra.

"Woke up before all 3 kiddos to get my steps in and spend time with me, myself, and I," she captioned the photo.

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Woke up before all 3 kiddos to get my steps in and spend time with me, myself, and I. Move move move for your own mental health. 💪🏻

A post shared by Jessica Simpson (@jessicasimpson) on May 27, 2020 at 9:46am PDT

"Move move move for your own mental health."

In 2019 after the birth of her third child Birdie Mae, the 39-year-old undertook a dramatic lifestyle change and enlisted the help of trainer Harley Pasternak.

In 2019 after the birth of her third child, Jessica Simpson undertook a dramatic lifestyle change and enlisted the help of trainer Harley Pasternak. Photos / Getty Images, Instagram

"The difference between this and the other times was that she worked out, yes, but her transformation was more about what she did on her own time," he told People.

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Red Hot for @macys! Can’t wait to see you and all of my favorite @jessicasimpsonstyle pieces including these Alesta heels✨ #OpenBookLOOKS

A post shared by Jessica Simpson (@jessicasimpson) on Feb 5, 2020 at 3:06pm PST

"She was so motivated and positive. She was saying that her body has not belonged to her for the past decade. Not in a bad way, in a positive way – her body has been designated to create life and now it's hers again and she's going to make it fantastic in a really enjoyable way."

Pasternak told People he gave Simpson five daily tasks to maintain her discipline: getting in her steps, unplugging from technology for an hour, getting sleep, eating healthy and exercising.

However, he noted that despite her impressive shedding of pregnancy weight, Simpson's gym time was only 45 minutes for three days a week.