Radziwill was married three times. Her first marriage, in April 1953, was to Michael Temple Canfield, a publishing executive. They divorced in 1958, and the marriage was annulled by the Catholic Church in November 1962. Her second marriage, on March 19, 1959, was to the Polish aristocrat Prince Stanisław Albrecht Radziwiłł, who divorced his second wife, the former Grace Maria Kolin, and received a Roman Catholic annulment of his first marriage to re-marry. (His second marriage had never been acknowledged by the Roman Catholic Church, so no annulment was necessary.)