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The order of the closing onscreen cast credits differs slightly from the opening order. According to a 1952 Los Angeles Examiner news item, Katharine Hepburn was planning to star in the film, which was to be an independent production by a British company. Hepburn had starred in a 1952 Broadway revival of George Bernard Shaw's play, and according to several news items, owned the rights. At the time, negotiations were ongoing with Charles Boyer to co-star.
By June 1953, a Hollywood Reporter news item announced that Jos Ferrer and Hepburn were talking about co-starring in the film. In January 1955, Daily Variety announced that American auto magnate Walter Chrysler, Jr. would finance the picture under the supervision of Lester Cowan. By June 1955, however, Los Angeles Times announced that producer Howard Welsch had bought the rights to the play from the Shaw estate and that Nicholas Ray was slated to direct. In September 1958, a Los Angeles Times news item stated that Hepburn wanted Louis Jourdan to co-star and that Preston Sturges was to write the screenplay. Although an April 1960 Daily Variety news item noted that The Millionairess was to be a production of Loren's husband, Carlo Ponti, the extent of Ponti's participation in the released film has not been determined.