Did Jean Simmons and Marlon Brando ever have an off-screen romance together?

There is no verified evidence or generally accepted reports that Jean Simmons and Marlon Brando had an off-screen romance. They starred together in the 1953 film "Desiree", where their on-screen chemistry led to speculation about their relationship. However, both actors were known for their professionalism and no credible sources have confirmed an off-screen romance between them.

Jean Simmons was married to actor Stewart Granger from 1950 to 1960, and Marlon Brando was known for his numerous relationships, but there is no substantial information linking him romantically to Simmons outside of their professional work.

https://www.independent.co.uk/news/obituaries/jean-simmons-actress-who-dazzled-opposite-the-likes-of-marlon-brando-kirk-douglas-and-laurence-olivier-1878829.html