 In 1951, he married Simone Signoret, and they co-starred in several films throughout their careers.The marriage was, by all accounts, fairly harmonious, lasting until her death in 1985, although Montand had a number of well-publicized affairs, notably with Marilyn Monroe, with whom he starred in one of her last films, "Let's Make Love".He was the stepfather to Signoret’s daughter from her prior marriage, Catherine Allégret.