Jessica Simpson documented her swollen ankles and visible baby bump during her most recent pregnancy. Six months after giving birth to her daughter Birdie Mae, the mother of three has lost 100 pounds.

Jessica, 39, reflected on her weight reduction struggle after giving birth to her baby in March on Instagram on Tuesday.

Simpson captioned a two-photo slideshow featuring herself alone and one with her 6-month-old daughter girl, “6 months. 100 pounds down (Yes, I tipped the scales at 240 😜).”

“My first trip away from #BIRDIEMAE and emotional for many reasons, but so proud to feel like myself again.” Added the star of her post-baby body, “Even when it felt impossible, I chose to work harder.”

Simpson’s celebrity pals praised her efforts.

“You have and always will be my inspiration,” “Jersey Shore” star Nicole “Snooki” Polizzi said, while actress January Jones wrote, “Wowza lady, you look (bomb).”

“You look amazing!” Katie Couric said.

Fans are giving their support as well.

“Love your honesty,” one person wrote. “You’re such a positive role model for mamas and women!”

Another remark said, “The way you are able to snap back after pregnancy is just amazing. Congratulations to you on the hard work.”

“You look amazing — but you always have regardless of your size!” a follower added. “Way to work hard and take care of yourself.”

She did not reveal her diet or training plan, despite having previously worked as a spokesperson for Weight Watchers.

She notoriously struggled with her weight after becoming a mother and has achieved incredible weight-loss accomplishments three times with the help of celebrity trainer Harley Pasternak. Following Simpson’s latest slimming shot, the pro came to Instagram to congratulate her. “Beyond proud of this incredible woman. Been working together for over 12 years and she’s always the most warm, sweet, polite, and respectful person in the world,” wrote Pasternak. “And on top of it all, after being nonstop pregnant for as long as I can remember, she’s down 100 pounds and looks younger today than she was when we met.”

After celebrating husband Eric Johnson’s 40th birthday this past Sunday “with close friends and family,” a friend of Simpson tells PEOPLE that she is “doing great.”

“She’s working hard and working out and eating healthy and trying to get back in her best shape and excited for what’s ahead,” a source said of Simpson, whose upcoming memoir will be released on February 4th.

The insider continued, “She’s trying to get back to her healthiest place. And she just wanted to get to a place where she feels her healthiest. She’s not focused on the number, but on feeling her best self.”