Watch Ronny Full Movie Free Online 123Movies. Käthe von Nagy plays Ronny, who designs the costumes for the upcoming premiere of an opera written by the young prince of Perusa (Willy Fritsch) and has to deliver them personally due to the urgency of the commission. Arriving there, the prince not only is charmed by the young lady (who wouldn't?), but also mistakenly believes her to be the famous singer who is to be the female lead in the opera. What Willy does not know yet is that the real singer has cancelled her appearance, and as the state ministers hope to distract him from politics with the performance of the opera, they indeed want Ronny to appear in the show….