In March of this year, just about half a year ago now, Jessica Simpson gave birth to her third child, Birdie Mae, and in that time has reportedly lost a staggering 100 lbs.

With the goal of being able to fit back into her pre-pregnancy wardrobe, the actress and singer worked tirelessly with her longtime trainer Harley Pasternak and Sydney Liebes at Harley's studio. Jessica also followed The Body Reset Diet to help her to reinstate her old healthy eating habits.

The 39-year-old called Harley "days after she gave birth," the trainer told People.

"She was so motivated and positive," he added. "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."

"I’ve kind of helped her come back after each baby, and this is a bit different, in that she said she was tipping the scales at 240 [post-delivery]. This is sort of the aggregate of being pregnant nonstop for a decade, and so we had a little more of a challenge between this and the other ones."

"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," Pasternak continued.

Anyway, in response to Jessica having lost 100 lbs of her post-baby weight (an almost-unbeatable feat by most standards), comic Amy Schumer revealed that she, in comparison, has lost a meagre 10 lbs in an Instagram post featuring her and her sister.

The 38-year-old I Feel Pretty actress captioned the snap, "Ok Simpson! Well ive lost 10 pounds and 100 dollars to my sister playing poker. #norush #givememymoneybackkim."

Hilariously, Jessica saw the post and assured the mom-of-one didn't need to lose any weight.

"You're hot," she wrote. "Size only matters when it comes to men," alongside a winking emoji with the tongue sticking out.

Oh boy...

In March of this year, just about half a year ago now, Jessica Simpson gave birth to her third child, Birdie Mae, and in that time has reportedly lost a staggering 100 lbs.

With the goal of being able to fit back into her pre-pregnancy wardrobe, the actress and singer worked tirelessly with her longtime trainer Harley Pasternak and Sydney Liebes at Harley's studio. Jessica also followed The Body Reset Diet to help her to reinstate her old healthy eating habits.

The 39-year-old called Harley "days after she gave birth," the trainer told People.

"She was so motivated and positive," he added. "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."

"I’ve kind of helped her come back after each baby, and this is a bit different, in that she said she was tipping the scales at 240 [post-delivery]. This is sort of the aggregate of being pregnant nonstop for a decade, and so we had a little more of a challenge between this and the other ones."

"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," Pasternak continued.

Anyway, in response to Jessica having lost 100 lbs of her post-baby weight (an almost-unbeatable feat by most standards), comic Amy Schumer revealed that she, in comparison, has lost a meagre 10 lbs in an Instagram post featuring her and her sister.

The 38-year-old I Feel Pretty actress captioned the snap, "Ok Simpson! Well ive lost 10 pounds and 100 dollars to my sister playing poker. #norush #givememymoneybackkim."

Hilariously, Jessica saw the post and assured the mom-of-one didn't need to lose any weight.

"You're hot," she wrote. "Size only matters when it comes to men," alongside a winking emoji with the tongue sticking out.

Oh boy...