Which was Lauren Bacall’s first film?

"To Have and Have Not" is a 1944 American romance-war-adventure film directed by Howard Hawks. The film stars Humphrey Bogart, Walter Brennan and Lauren Bacall in her film debut. Although it is nominally based on the novel of the same name by Ernest Hemingway, the story was extensively altered for the film.

Lauren Bacall was then a 19-year-old model. She appeared on the cover of Harper's Bazaar, and was noticed by Hawks' wife, Nancy "Slim" Keith, who showed the cover photo to her husband. Hawks sought Bacall out and signed her for the role, her first movie appearance. In the movie, Harry calls her by the nickname "Slim", and she calls him "Steve", the nicknames used between Keith and Hawks.

After filming began, a romance developed between Bogart and Bacall, despite Hawks' disapproval. Not only was Bogart married but, at 45, he was more than twice Bacall's age. This romance eventually led to Bogart divorcing Mayo Methot, his third wife. He and Bacall later married, and remained married until Bogart's death in 1957.