here are nine books in the Diary of a Wimpy Kid series, and two additional books: The Wimpy Kid Do-It-Yourself Book, and The Wimpy Kid Movie Diary. The series started off online on Funbrain.com in 2004 and made its print debut in April of 2007. There are now more than 150 million copies of Diary of a Wimpy Kid books available in 51 editions and 45 languages.