‘Black Widow’ star Scarlett Johansson has boarded the cast of ‘My Mother's Wedding’, which marks the feature directorial debut of ‘The English Patient’ star Kristin Scott Thomas. According to Deadline, ‘The Lost City Of Z’ star Sienna Miller, Emily Beecham of ‘Little Joe’ fame and Frieda Pinto (‘Slumdog Millionaire’) will also star in the movie.