10 is a 1979 American romantic comedy film written, produced and directed by Blake Edwards and starring Dudley Moore, Julie Andrews, Robert Webber and Bo Derek. It was considered a trendsetting film at the time of its release and became one of the year's biggest box-office hits. The film follows a middle-aged man who becomes infatuated with a young woman whom he has never met, leading to a comic chase and an encounter in Mexico.