"So, what I want to know is, if my dad's an actual prince, how come I have to learn algebra?" Mia ponders this, and much more, when she finds out that her father is prince of Genovia. Living with her cool artist mom in New York City, Mia can't imagine leaving to become princess in Genovia. But because her father can't have any more kids, she is the heir to the throne. Accepting her title means getting lessons on being a perfect princess and leaving Manhattan - will Mia eventually give in to her father and become Princess Amelia Mignonette Grimaldi Thermopolis Renaldo?

Thermopolis is pretty sure there's nothing worse than being a five-foof-nine, flat-chested freshman, who also happens to be flunking Algebra.
Is she ever in for a surprise.

First Mom announces that she's dating Mia's Algebra teacher. Then Dad has to go and reveal that he is the crown prince of Genovia. And guess who still doesn't have a date for the Cultural Diversity Dance?

一位平凡的高中女學生Mia，生活日復一日平淡無奇，然而這一切突然間有了改變，Mia赫然發現自已身份正是一位公主！從醜小鴨變成天鵝的Mia，她與同學好友間的關係有了微妙變化，然而Mia要如何面對生活的轉變呢？ ●Mia