克里斯蒂娜·哈特（Christina Hart），Christina Hart was born as Christina Hartzell. She is an actress and writer, known for Charley Varrick (1973), Happy Days (1974), Helter Skelter (1976), The Love Boat (1977), and Three's Company (1977). She was previously married to Frank Doubleday and is the mother of actresses Kaitlin and Portia Doubleday.