Craig Barritt/Getty Images
Brandi Fowler
May 17, 2016 @ 7:00 pm

Hilary Duff's son is growing up so fast ... and getting more stylish by the minute! The proud mom couldn't help but share an adorable snap of her 4-year-old tyke as he headed to school in a mixed-print ensemble that she swooned over.

"Luca rockin the cutest @theicecreamcastles tee! #readyforschool," the 28-year-old Younger star captioned the Instagram photo, which showed the boy rocking a graphic T-shirt covered in sailboats and green, rolled-up printed shorts. With mussed blonde hair, he posed for his mom's cell phone camera in front of a wooden door.

Luca rockin the cutest @theicecreamcastles tee! #readyforschool

A photo posted by Hilary Duff (@hilaryduff) on

Duff hasn't been shy about posting photos of her son—and his fashionable stylings—on social media. Just last week, she shared a heartwarming black-and-white snap of herself giving her son a kiss as they sat in a booth at a restaurant and enjoyed a doughnut and other grub together. "Oh what you do to me. #greatmothersday," she wrote alongside the photo, which showed Luca sporting a rolled-up denim top.

Oh what you do to me. #greatmothersday

A photo posted by Hilary Duff (@hilaryduff) on

RELATED: Hilary Duff's Stylish Son Luca Rocks a Mean Moto Jacket

The actress also recently mused about motherhood on the 'gram, posting a shot of Luca walking in a printed top and matching pants, writing, "But this kid tho [heart emoticon] ....however four is no joke if any of you moms out there hear me! Lol."

But this kid tho ....❤️.....however four is no joke if any of you moms out there hear me! Lol

A photo posted by Hilary Duff (@hilaryduff) on

Still, Duff seems to be managing motherhood well, and with a smile (and eye for fashion) like little Luca's, there's a good chance he melts her heart even in the trickiest times of his fearsome fours.

We are so proud of this boy!

A photo posted by Hilary Duff (@hilaryduff) on

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