Radziwill married three times. Her first husband was Michael Canfield, a publishing executive. They married on April 18, 1953, and moved to London, England. They divorced in 1958. She married Prince Stanislas Radziwill on March 19, 1959. They had two children; Anthony (1959-1999) and Christina (b. 1960). They divorced in 1974. She then moved back to the United States, where she married film director Herbert Ross, on September 23, 1988. They divorced in 2001 shortly before Ross's death.