Son Gus Monroe Deveraux Sanford was born on Tuesday, Nov. 11 in Los Angeles, according to People. He weighed 7 lbs., 4 oz. and measured 20.5 inches long.
The “Unforgettable” star and her Microsoft executive husband Shawn Sanford also have a daughter Violet Grace, 19 months, together.
Montgomery, 42, is also mom to son Jackson, 6, from a previous relationship.