09:22 29/05/2020 Bashiera Parker (@bparks_)

Jessica Simpson is almost unrecognisable in her latest post on Instagram.

The actress lost 45kg after baby number three, which resulted in the drastic transformation.

"Woke up before all three kiddos to get my steps in and spend time with me, myself, and I. Move move move for your own mental health," she wrote on the post, which shows off her toned abs and legs as she wears her own activewear line, according to People.

SEE THE POST HERE:

A source tells Entertainment Tonight the 39-year-old has been walking outdoors and on the treadmill to stay in shape during lockdown. But they added: "It's the way she stays sane, so it's as much for mental health as it is for physical wellness."

Speaking to E! News, her trainer Harley Pasternak also revealed it was about developing healthier eating habits, along with gradually introducing working out, before moving on to more intense training, that has actually helped the star feel better overall.

"She is feeling like she did before she had kids," he said. "In control of everything and such a great attitude of not beating herself up if she doesn't eat perfectly everyday, so it's a very helpful perspective."

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Jessica Simpson reveals drastic transformation as she focuses on mental health and physical wellness - Channel 24