Jessica Simpson's kids look like little models as they pose for school photos

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Jessica Simpson's look-alike children are growing up so fast!

The proud mother shared a behind-the-scenes pic over the weekend of her 4-year-old daughter, Maxwell, and her 3-year-old son, Ace, flashing their biggest smiles while posing for school photos.

"Seriously?!?!?" Simpson gushed. "Thank you God for these precious kiddos. #maxidrew #aceknute"

Behind the scenes of school pictures...seriously?!?!?Thank you God for these precious kiddos. #maxidrew #aceknute

A photo posted by Jessica Simpson (@jessicasimpson) on

Earlier this year, Simpson told ET that she credits her kids for keeping her in shape. "I think being a mom is enough of a diet," she quipped. "You have to run around chasing your kids, but I do eat a lot of their corn dogs, so I have to get on the treadmill a lot to watch my TV shows."

WATCH: Jessica Simpson's Daughter Accidentally Cuts Her Own Hair -- 'Mommy Is Not Happy'

As for whether she and husband Eric Johnson have plans to expand their brood, the 36-year-old star told ET, "I don't think I could have another baby right now. It was a very, very big shock after having a baby and four months later knowing I was pregnant again, so I think that's not in our near future."

WATCH: Jessica Simpson's Daughter Maxwell Has Officially Become Her Mother's Doppleganger

She added, "But people have kids at 40 now, so you never know."

PHOTOS: Jessica Simpson rocks sexy jumpsuit

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Jessica Simpson rocks sexy black jumpsuit
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Jessica Simpson rocks sexy black jumpsuit
NEW YORK, NY - OCTOBER 25: Jessica Simpson attends the 2016 FFANY Shoes On Sale Gala Fundraiser hosted by QVC at The Waldorf Astoria on October 25, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK, NY - OCTOBER 25: Jessica Simpson attends the 2016 FFANY Shoes On Sale Gala Fundraiser hosted by QVC at The Waldorf Astoria on October 25, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK, NY - OCTOBER 25: Jessica Simpson attends the 2016 FFANY Shoes On Sale Gala Fundraiser hosted by QVC at The Waldorf Astoria on October 25, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK, NY - OCTOBER 25: Jessica Simpson attends 'FFANY Shoes On Sale' hosted by QVC on October 25, 2016 in New York City. (Photo by Andrew Toth/Getty Images for Fashion Footwear Charitable Foundation)
NEW YORK, NY - OCTOBER 25: Jessica Simpson attends the 2016 FFANY Shoes On Sale Gala Fundraiser hosted by QVC at The Waldorf Astoria on October 25, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK, NY - OCTOBER 25: Jessica Simpson attends the 2016 FFANY Shoes On Sale Gala Fundraiser hosted by QVC at The Waldorf Astoria on October 25, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK, NY - OCTOBER 25: Jessica Simpson attends the 2016 FFANY Shoes On Sale Gala Fundraiser hosted by QVC at The Waldorf Astoria on October 25, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK, NY - OCTOBER 25: Jessica Simpson attends the 2016 FFANY Shoes On Sale Gala Fundraiser hosted by QVC at The Waldorf Astoria on October 25, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK, NY - OCTOBER 25: Jessica Simpson, bag detail, attends the 2016 FFANY Shoes On Sale Gala Fundraiser hosted by QVC at The Waldorf Astoria on October 25, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK - OCTOBER 25: Jessica Simpson seen out in Manhattan on October 25, 2016 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
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