Makenzie Vega is an American actress. She began her career in the late 1990s. Her initial roles include the TV movie Dr. Quinn: Revolutions. She then joined the main cast of the TV series The Geena Davis Show. In the movies, her first significant role was as Diana Gordon in the the feature film Saw. She next played the young Young Nancy Callahan in Sin City. She also played a supporting role in the movie Just My Luck. Back on television, she became known for her role as Grace Florrick on the TV series The Good Wife.