Academy Award winning American film actress who, upon marriage to Rainier III, Prince of Monaco on April 19, 1956, became Her Serene Highness The Princess of Monaco. TLS, one page, 6 x 8, September 18, 1954. Letter of thanks to an admirer. In part, “It is very gratifying to know that any contribution I have made has been so generously received. I have just returned from California, after making another picture with Alfred Hitchcock, and am now taking a long anticipated vacation with my family.” Accompanied by the original mailing envelope. In fine condition, with horizontal fold and some light creasing to lower right corner. PSA/DNA Auction LOA and R&R COA.