The Princess Diaries 3📖 Teen Movies 👈🏻 Mia Thermopolis, a shy teenager from San Francisco who recently discovered she is the heir to the throne of Genovia, stars in this 2025 family comedy. Her late father was, apparently, a Genovian prince. She is therefore forced to choose between assuming the throne and living the life of a San Francisco teenager. Mia faces pressure from her grandmother to learn how to be a princess while reflecting on the matter. Eventually, she accepts her new status and moves to Genovia as a princess, despite her repeated escape plans. Lasting life lessons about accepting oneself, developing self-confidence, and prioritizing genuine character over popularity are taught in The Princess Diaries 3.