Mia Thermopolis is now a college graduate and on her way to Genovia to take up her duties as princess. Her best friend Lilly also joins her for the summer. Mia continues her 'princess lessons'- riding horses side-saddle, archery, and other royal. But her complicated life is turned upside down once again when she not only learns that she is to take the crown as queen earlier than expected...

Network television executive Gavin hopes to reunite celebrated Hollywood stars Piper Grayson, Kate Westbourne, and Addie Holden in a TV special after their 1960s movie musical Boy Crazy is re-released. Though the three women share the same agent, Gavin's seemingly insurmountable obstacle is that they all cannot stand each other.

Blue-collar worker Vince stumbles into a dance school, where he quickly becomes entranced by the music. Miss McKenzie, the school's manager and former owner, is about to throw him out on his ear when Moon, the school's rebellious new jazz instructor, vouches for him. Although the school's new owner has insisted on bringing in Moon as a teacher, Miss McKenzie absolutely hates him and the influence of his mordern music, and will stop at nothing to see him (and Vince) thrown out for good.