Scarlett Johansson's character in the film, Katherine, and her younger sisters, Victoria (Sienna Miller) and Georgina (Emily Beecham), come together to celebrate the third marriage of their twice-widowed mother, Diana (played by Scott Thomas). Diana's first two husbands, the girls' parents, both died when the girls were little.

Christiane Amanpour speaks to actor Kristin Scott Thomas about stepping behind the camera for the first time for her new film ‘My Mother’s Wedding’.