She has become an advocate for post pregnancy women who struggle with weight loss, speaking out against the pressure new moms face.
And after two babies in less than two years, Jessica Simpson knows just how hard it can be to ditch those extra pounds.
But as this incredible Instagram picture shows, the singer and actress has well and truly seen off her critics revealing her muscular legs in a pair of tiny green shorts on Saturday.
Muscular: Jessica has proved the haters wrong and got back back to peak physical fitness revealing her incredible legs on Instagram on Saturday
The dramatic photo taken during a work-out session, highlights her highly defined thigh and calf muscles and illustrates just how far the 33 year-old has come since her heaviest days in 2012 after the birth of her daughter Maxwell.
Just five months after her first child was born, Jessica discovered she and fiance Eric Johnson, 34, were expecting again and she gave birth to son Ace Knute in June last year.
Now, less than 12 months on and she is seemingly in the best shape of her life.
Then and now: Jessica’s hard work and dedication to diet and exercise has paid off
She wrote to her 400,000 Instagram followers: ‘These are my legs during a workout today! I’m proud of myself’.
Of course Jessica, a spokesmodel for Weight Watchers, has the perfect motivation to get in shape with her wedding to Eric just around the corner.
The couple will tie the knot in the picturesque California city of Santa Barbara over the weekend of July 4th.
Soon to be Mr and Mrs: Jessica and Eric will become man and wife over the weekend of July 4th in Santa Barbara
They have already had to abandon wedding plans twice because of her pregnancies.
She joke on The Tonight Show: ‘We’ve had two different wedding dates, but he keeps knocking me up!’
‘We’re doing it very backwards,’ she told host Jay Leno in January last year while expecting Ace.
This will be Jessica’s second marriage, she was previously wed to former boyband member Nick Lachey.
Getting there: Jessica pictured at an event in New York in December last she had already lost enough weight to carry off this figure hugging dress.