Jessica Simpson – Age 40
Especially after baby number three in 2019, it looked as though Jessica Simpson had lost control over her weight. Of course, she was a star-material either way, but that didn’t stop her from wanting to make a change. According to her Instagram account, she weighed around 240 pounds at her heaviest.

Within half a year after giving birth, Simpson was flaunting a completely different body. Women’s Health magazine mentions that she worked closely with her personal trainer to achieve the change. In 2020 she published the Open Book memoir, which is now a New York Times Best-Seller.