There are eight 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 75 million copies of Diary of a Wimpy Kid books in print in 41 different languages.
The Ugly Truth is Book #5 by author Jeff Kinney:
Greg Heffley has always been in a hurry to grow up. But is getting older really all it's cracked up to be?
Greg suddenly finds himself dealing with the pressures of boy-girl parties, increased responsibilities, and even the awkward changes that come with getting older—all without his best friend, Rowley, at his side. Can Greg make it through on his own? Or will he have to face the "ugly truth"?