Summary of "Princess Diary"

Mia is a main character of the book, titles "Princess diary"
This book is one of the best seller in entire world today.
There are also movie based on this book. So from today, I would like to start writing summary of this book.

Mia is a normal girl living in America. One day her mother told her to write her feeling in a diary, because her mother thought she was not being honest to her. However, she does not feel good to write her feeling on it. This is how the story begin. First day, she wrote about her mother and her math teacher. They are dating today, but she doesn't want to believe that her mother likes her math teacher.