Jessie James Decker Delights With Back-to-School Photos of 'Grown Up' Kids

Jessie James Decker "still can't believe" how fast her kiddos are growing up—and neither can her fans!

The country singer and mother of four took to Instagram on Monday, Aug. 19, to mark the first day of school for her three oldest kids—Vivienne Rose Decker, 10, Eric "Bubby" Thomas Decker II, 8, and Forrest Bradley Decker, 6—whom she shares with husband and retired NFL player Eric Decker.

In the wholesome back-to-school snaps, she captured a smiling photo of her three school-aged children posing arm-in-arm together before snapping a solo shot of each child holding up a chalkboard sign filled with information about their upcoming school year.

Also making an appearance in Monday's Instagram post was the couple's youngest baby, son Denver Calloway Decker, whom the singer and the former football wide receiver welcomed back in February.

"First day of school for the Decker kids! ????," the Kittenish founder wrote in her caption on Instagram, adding, "I still can’t believe I have a middle schooler and a 6month old ??????."

Fans were equally as awestruck after seeing the photos and witnessing how fast the "Lose Control" singer's three oldest kiddos have grown up.

"They all look so grown up omg????," one fan wrote under the post, while someone else commented on the "growth spurts" that the singer's kids have clearly been experiencing lately.

James Decker's mom, Karen Parker, also took to the comments to gush over her grandkids, writing under the photos, "These beautiful babies are growing up way too fast!"

Next: Fans Shower Jessie James Decker With Praise as She Posts Vulnerable Bikini Snaps