Ashton Kutcher and wife Mila Kunis stepped out for a rare outing with their eight-year-old son Dimitri in Studio City on Friday. Ashton Kutcher, 46, and wife Mila Kunis, 41, stepped out for a rare outing with their eight-year-old son Dimitri in Studio City on Friday She easily carried a small, cross-body bag over her right shoulder and added a …