Schön ist die Welt (1957)

The famous opera singer Rudolf Halden hasn't a clue what to do when his manager submits a business proposal to him from a wealthy dumpling-manufacturer by the name of Block. If Halden co-stars with Block's daughter onstage, he'll earn a neat 40,000 Marks. The girl, while talented, is a complete unknown. Ego just a tad inflated, Halder brusquely rejects the offer. Unfortunately, a lawsuit goes badly for him shortly thereafter and he really needs the dough. So, he'll agree to the proposal after all with a secret plan to make life as difficult as possible for the "star" he'll be playing opposite.