The mother of two became a spokesperson for the company after giving birth to her daughter, Maxwell Drew Johnson, and she was already back on the diet when she gave birth to her son, Ace Knute Johnson over the summer.
Jessica took a lot of flack for the weight she gained during her first pregnancy. "I just let myself have whatever I wanted, I didn't care. It wasn't about weight gain for me," she confessed on Good Morning America earlier this month. "When I was pregnant with Ace, my second, I was already on Weight Watchers, and I had already lost 50 pounds, so I wasn't as relaxed in my eating as I was with Maxwell."
She also said that she and fiance Eric Johnson go on walks together, telling USA Today, "I try and walk about 4 miles a day consistently. It makes me feel better."
Her super strict regimen is certainly paying off, because this is probably the best we've EVER seen the fashion designer's figure look.
Keep up the good work, girl!
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Gallery | Jessica Simpson's Adorable Family Photos