"The Princess Diaries" is a 2001 film directed by Garry Marshall, based on the novel by Meg Cabot. The story follows Mia Thermopolis, a shy teenager living in San Francisco, who discovers she is the heir to the throne of the fictional European country of Genovia. With the help of her estranged grandmother, Queen Clarisse, Mia learns how to embrace her royal identity. The film stars Anne Hathaway as Mia and Julie Andrews as Queen Clarisse. It explores themes of self-discovery, friendship, and the challenges of adolescence. "The Princess Diaries" became a popular family film and led to a successful sequel, further expanding Mia's royal adventures.