International bestselling author Jeff Kinney serves up heaps of laughs in Partypooper, the 20th book in the Diary of a Wimpy Kid series. You're Invited-RSVP for Fun! Over the years, Greg Heffley has chronicled his mishaps and misadventures in a series of diaries-make that journals-but book 20 of the Diary of a Wimpy Kid series, Partypooper, really takes the cake! Expect gobs of fun and over-the-top antics as Greg throws an epic birthday party for none other than himself. So come celebrate and laugh alongside Greg, his family, and the entire world of Wimpy Kid fans.