Katy Perry has already made a 3D movie about her career, Part Of Me, and now she's signed a contract to write a book with the same title. The book will cover everything about the star, both her career and personal life - including her relationship with ex husband Russell Brand, according to Contactmusic.

Russell is also writing a book about their life together, which is said to be one of the main reasons she signed the $3.2 million dollar contract so fast.