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In addition to baby Birdie, Simpson, 39, and her husband, former NFL player Eric Johnson, 40, are parents to daughter Maxwell Drew, 7, and son Ace Knute, 6. To get back in shape after each pregnancy, Simpson, a former spokeswoman for Weight Watchers, now known as WW, has worked out with celebrity trainer Harley Pasternak, who reposted her photo from Tuesday.

\"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,\" he captioned the post. \"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.\"

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