“My little/big,” the Younger star, 29, captioned the image of her son pointing to the sky while riding a scooter.
The single mom recently posted a photo playing mini golf with her only child.
“He beat me fair and square,” she wrote.
The singer-actress recently celebrated her son’s fifth birthday with a Ghostbusters-themed party.
Luca’s father, Duff’s ex-husband Mike Comrie. is currently facing serious legal allegations.
Reportedly, the former hockey star, 36, is being investigated for rape. While he says it was consensual, an unidentified woman claims he raped her multiple times. She then went to Cedars-Sinai Medical Center almost immediately, and a rape kit was administered.
He beat me fair and square. ? A post shared by Hilary Duff (@hilaryduff) on