Princess Mia has been busy since we left her in the Princess Diaries. She has had Princess lessons, and has also just graduated from college.
Queen Clarisse, Mia's grandmother, wants to step down so that Mia can become Queen but the royal ad visors say that she can not be Queen until she is married. There is another hiccup also. Viscount Maybrey wants his nephew Nicholas Devereaux to be King since he also has royal ancestry. The advisers say they will give Mia one month to find a husband and then she can become Queen.
Mia is given a list of suitable husbands (one of which was Prince William) and she picks Andrew Jacoby, Duke of Kenilworth. They get engaged to be married, but Mia finds herself falling for Nicholas instead (even though she cannot stand him.) Things come to a head at Mia and Andrew's wedding. What happens after? Watch the movie.
This is a very good sequel to The Princess Diaries and Anne Hathaway and Chris Pine (who plays Nicholas) are great.