Celebrity Hilary Duff Shows Off 4-Year-Old Son Luca's Totally Hip New Look By Brandi Fowler Brandi Fowler Instagram Website In addition to her extensive fashion, lifestyle, and beauty coverage for InStyle, Brandi has worked as a writer and editor for E! Online, a fashion and lifestyle writer for Hello! US, an editor/on-camera host for AOL, contributing writer and red carpet correspondent for Variety and Cosmopolitan, and has also served as the Hollywood correspondent for Australia's 9News' TheFIX. Her editorial features can also be found on Vitruvi, MTV News, Madame Noire, Hello Beautiful and more covering fashion, beauty, lifestyle, travel, and entertainment news. Her articles have been syndicated by the likes of Health, Marie Claire, Essence, Shape, Yahoo!, People, and more. InStyle's editorial guidelines Updated on May 17, 2016 @ 07:00PM Pin Share Tweet Email Photo: Craig Barritt/Getty Images 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. 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. 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." 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.