Until recently, Mia Thermopolis was an ordinary schoolgirl; now she is the heir to the throne of the small European state of Genovia. Her grandmother—a widowed princess who teaches Mia royal etiquette—arranges interviews for her on America’s most popular TV show. But the interview turns into a disaster: Mia mocks the teachers of her own school, reveals her mother’s secret, and quarrels with her friends—all in front of a multi-million audience…