"Baby, It's Cold Outside" is a song with words and music by Frank Loesser. Although popular during the Christmas season. Loesser wrote the duet in 1944 and premiered the song with his wife, Lynn Garland, at their Navarro Hotel housewarming party, and performed it toward the end of the evening, signifying to guests that it was nearly time to end the party. Garland considered it "their song" and was furious when Loesser sold the song to MGM.
In 1948, after years of informally performing the song at various parties, Loesser sold its rights to MGM, which inserted the song into its 1949 motion picture, Neptune's Daughter. The film featured two performances of the song: one by Ricardo Montalbán and Esther Williams and the other by Red Skelton and Betty Garrett, the second of which has the roles of wolf and mouse reversed. These performances earned Loesser an Academy Award for Best Original Song.