Roberto Rossellini and Ingrid Bergman.
When Ingrid was filming Stromboli, everyone on set assumed that she was happily married to her Swedish surgeon husband, Peter Lindstrom. Except the film’s director, Roberto Rossellini. During their time working together, the two quickly became close. She was pregnant despite her history of infidelity. A week after giving birth to Roberto’s son, she filed for divorce. They tied the knot in Mexico, but divorce was announced in 1957.