Ashley Olsen and National Treasure star Justin Bartha are allegedly planning to marry in France in a $1 million secret ceremony next summer. A source close to Olsen revealed to Hollyscoop: “Ashley has dreamed of having her wedding on the French Riveria and she’s going to ask her favorite designer and friend, fashion icon Karl Lagerfeld, to create a custom-designed gown to the tune of a quarter-million dollars.” The 22-year-old actress and Bartha, 30, have been dating since May. In attendance will be Ashley’s twin, Mary-Kate, as well as their older brother Trent, 19-year-old sister Lizzie, half-sister Taylor and half-brother Jake. Ashley also hopes to have photographer Annie Liebovitz capture the entire event on film. In their new book, Influence, released last week, the twins, who come from a broken home, talk about marriage, with Ashley revealing she wants to get married and have children, while Mary-Kate doesn’t see herself ever getting married.