Jessica Simpson celebrates 100-lbs. weight loss since giving birth 6 months ago

Jessica Simpson couldn't be prouder of herself.

The 39-year-old took to Instagram on Tuesday to share her weight loss journey -- since giving birth to 6-month-old daughter Birdie Mae in May -- with her followers.

"6 months. 100 pounds down (Yes, I tipped the scales at 240 😜)," Simpson wrote alongside a photo of herself rocking a head-to-toe black outfit.

JESSICA SIMPSON TALKS MOTHERHOOD, SAYS HAVING 3 YOUNG CHILDREN IS 'NO JOKE'

"My first trip away from #BIRDIEMAE and emotional for many reasons, but so proud to feel like myself again," the mom of three continued. "Even when it felt impossible, I chose to work harder. 💚"

Many of Simpson's fans praised the business mogul. "You always look so beautiful, but especially today. You are an absolute inspiration to all of us," one commenter wrote.

JESSICA SIMPSON SHARES ADORABLE INSTAGRAM PHOTO OF BABY BIRDIE: 'THOSE DIMPLES!'

"I'm crying 💓💓💓💓💓I love you Jessica! Always beautiful but I'm so proud of you!" commented another person.

"💛 Love your honesty," stated one individual. "You're such a positive role model for mamas and women!"

CLICK HERE TO GET THE FOX NEWS APP

In addition to Birdie Mae, Simpson and her husband, former NFL player Eric Johnson, 40, share two children together: daughter Maxwell, 7 and son Ace, 6.