In "Princess Diaries 2: Royal Engagement," Mia Thermopolis, played by Anne Hathaway, discovers that she must marry before she can become the queen of Genovia. As she navigates the challenges of royal life, she faces pressure from her grandmother, Queen Clarisse, and the expectations of her people. Mia's journey includes a potential suitor, Lord Nicholas Devereaux, who seems charming but has his own motives. Throughout the film, Mia learns about love, responsibility, and what it truly means to be a leader, ultimately making choices that reflect her values and desires for her future.