The diary in the princess diaries?

You can't buy the diary itself, just the books in the series that are written like the diary. These can be found in most book stores.

In the book: the dad is alive, grandma is mean, Mia is blonde, Mia is in <3 with Michael not the other way around, Mia lives in NYC not SF, her bodyguards name is Lars and he has no romantic...

http://wiki.answers.com/wiki/Mia_Thermopolis is a fifteen-year-old http://wiki.answers.com/wiki/Tenth_grade private school student who lives with her mother Helen Thermopolis and her...

Mia or Princess Amelia Mignonette Thermopolis Renaldo.

In The Princess Diaries Book, Mia writes in a Black Marbled Mead Composition Notebook. In the movie, she writes in a red leather book.