Born into wealth as Caroline Lee Bouvier on March 3, 1933, the young stunner fancied a career in acting, and would seem to have had a leg up as the younger sister of America's beloved First Lady — but it was not meant to be. Her performances in the 1967 production of The Philadelphia Story in Chicago and in a TV adaptation of Laura (1968) were so panned she walked away from the craft.
Though she worked as a decorator and an Armani P.R. exec, Radziwiłł was more famed for her jet-setting personal life, which included following the Rolling Stones (1972) on tour; setting up Albert (1926-2015) and David (1931-1987) Maysles with her cousins "Big Edie" Beale (1895-1977) and "Little Edie" Beale (1917-2002), resulting in the classic documentary Grey Gardens (1975); and acting as the confidante of Andy Warhol (1928-1987) and Truman Capote (1924-1984).
Radziwiłł married three times: to P.R. exec Michael Temple Canfield (1926-1969), a marriage annulled by the Catholic Church in 1962; Prince Stanisław Albrecht Radziwiłł (1914-1976), a marriage that made her a princess; and director Herbert Ross (1927-2001).
She is survived by her daughter with Radziwiłł, Princess Christina. Her son with him, Prince Anthony, died at age 40 in 1999.