Jack Blues Bieber is growing up right before our eyes. Proud dad Justin Bieber shared a sweet snap via Instagram of Jack, 1, on Friday, September 12, showing his young son standing on his lap while the pair were inside a car. Jack was photographed wearing a diaper and leaning his hands against the vehicle's dashboard while Justin, 31, holds on to his ankles. The photo prompted an excited reaction from one fan, who commented, "Wait he looks exactly like youu .