SOCIAL: Jessica Simpson Celebrates Her 100-Pound Weight Loss 6 Months After Welcoming Her Third Child

Jessica Simpson Celebrates Her 100-Pound Weight Loss 6 Months After Welcoming Her Third Child The singer-turned-fashion-designer gave birth to her daughter, Birdie Mae in March. Since then, she has been navigating being a mother of three and making fitness a priority. Judging by her jaw-dropping 100-pound weight loss, it seems like Simpson has found a routine that works for her. "Six months. 100 pounds down (Yes, I tipped the scales at 240)," she wrote in an Instagram post. The 39-year-old mom worked with celebrity trainer Harley Pasternak after the birth of her daughter. So what is Simpson's weight-loss secret? Hard work, dedication, and Pasternak's five steps to success. "We had five habits that we tried to implement for Jessica," says the trainer. First, he made sure she was getting her steps in. She started with a daily goal of 6,000 steps and worked up to 12,000. To hit her goal each day, Simpson took walks around her neighborhood with her husband, Eric Johnson, and their children. If she came up short on her steps, she hopped on the treadmill to make up the difference, says Pasternak. Next, Pasternak helped Simpson establish a regular sleep schedule. He held her accountable for at least seven hours of "quality, uninterrupted sleep" each night. He also advised her to go screen-free for an hour every day to ensure she slept better. Pasternak also encouraged Simpson to embrace a healthy diet. She stuck to three meals a day and two light snacks between meals. Harley Pasternak Last but not least, Pasternak had Simpson on a regimented workout schedule every other day. Each 45-minute session focused on a different body part and started with a five-minute walk on the treadmill. They'd run circuits of two to three exercises. Simpson repeated each circuit five times. Simpson "always has the best attitude," says Pasternak. Even on her worst days, she was smiling and gracious. Harley Pasternak Of course, there's absolutely no rush for anyone to lose weight postpartum. Simpson said in her Instagram post that losing 100 pounds makes her feel "so proud," because she looks fantastic and feels like herself again.