Princess in the Spotlight, by Meg Cabot

In this book Princess Mia finds out her mother's pregnant with her Algebra teachers baby, that she has a secret admirer, and that her grandmothers are working together to plan a huge celebrity wedding for her mom.

I liked this book because it is realatable and unrelatable: Mia has the problems of a normal girl and the weird problems of being a princess.

Two other books I would recommend are: Princess Diaries AND Greenglass House.