The Princess Diaries is a charming coming-of-age film in which Anne Hathaway plays Mia Thermopolis, a socially awkward teenager who discovers that she is the heir to the throne of a small European country. As Mia navigates the challenges of royal life, she learns important lessons about self-confidence, friendship, and staying true to oneself. The film is a delightful blend of humor, romance, and heartwarming moments, making it a beloved favorite among audiences of all ages.