Frank Loesser, the great Broadway composer and lyricist, wrote “Baby, It’s Cold Outside” in 1944 to sing at parties with his wife, Lynn Garland. It was, she said, their ticket to all the best bashes. Five years later, to Garland’s distress, Loesser sold the tune to MGM for the 1949 movie “Neptune’s Daughter,” starring Esther Williams and Ricardo Montalban. It won a best song Oscar.
Source: latimes.com – Los Angeles Times