The Count of Luxembourg.

Der Graf von Luxemburg (The Count of Luxembourg) is an operetta in three acts by Franz Lehár to a German libretto by Alfred Willner, Robert Bodanzky, and Leo Stein. A Viennese take on bohemian life in Paris at the beginning of the 20th century, the story revolves around an impoverished aristocrat and a glamorous opera singer who have entered into a sham marriage without ever seeing each other and later fall in love at first sight, unaware that they are already husband and wife.