Just when you think Hilary Duff and her son, Luca, could not get any cuter, the former Disney star melted our hearts with yet another adorable snap on Monday. The 3-year-old and his mommy are shown making the cutest facial expressions while waiting at the doctor's office. Hilary posted the sweet photo on Instagram, writing, "Dr. office shenanigans." This isn't the first time these two have made you smile; Hilary is a regular at documenting precious moments with her little boy [2] on social media. See their fun moment above, then check out more photo-worthy families on Instagram [3].