 All of Rosemarys songs (including "Happy To Keep His Dinner Warm"  and "Paris Original") were cut from the movie version, so she was  given the song "I Believe In You". In the stage play, she does not  sing this to him, and the first time we hear it is during the scene  where Finch sings it to himself in the executive washroom (she does  feature in a brief reprise of the song after this scene).