THE ONE WITH GREG'S CHAOTIC BIRTHDAY PARTY The twentieth laugh-out-loud, fully-illustrated Diary of a Wimpy Kid book from #1 international bestselling author Jeff Kinney! A global phenomenon with 300 million copies of the series sold worldwide! It's Wimpy Kid Greg's birthday - and you're invited to the chaos. In Partypooper, the 20th book in Jeff Kinney's global smash-hit Diary of a Wimpy Kid series, Greg Heffley is planning the ultimate party - for himself. But when the guest list grows, the decorations flop, and the surprises backfire, this birthday bash turns into a total blowout-just not the kind Greg had in mind. Packed with cake disasters, family fiascos, and laugh out loud Wimpy Kid fun, this book is perfect for readers ages 8-12. WHAT'S IN DIARY OF A WIMPY KID? 50% words, 50% cartoons, 100% hilarious! Stories that all readers can't wait to get their hands on Laughter guaranteed! LOOK OUT FOR: Rowley Jefferson's Awesome Friendly Spooky Stories 2 in August 2026! Diary of a Wimpy Kid: Fight or Flight (Book 21) in October 2026! Have you read all the DIARY OF A WIMPY KID series? Diary of a Wimpy Kid Diary of a Wimpy Kid: Roderick Rules Diary of a Wimpy Kid: The Last Straw Diary of a Wimpy Kid: Dog Days Diary of a Wimpy Kid: The Ugly Truth Diary of a Wimpy Kid: Cabin Fever Diary of a Wimpy Kid: The Third Wheel Diary of a Wimpy Kid: Hard Luck Diary of a Wimpy Kid: The Long Haul Diary of a Wimpy Kid: Old School Diary of a Wimpy Kid: Double Down Diary of a Wimpy Kid: The Getaway Diary of a Wimpy Kid: The Meltdown Diary of a Wimpy Kid: Wrecking Ball Diary of a Wimpy Kid: The Deep End Diary of a Wimpy Kid: Big Shot Diary of a Wimpy Kid: Diper Overlode Diary of a Wimpy Kid: No Brainer Diary of a Wimpy Kid: Hot Mess Diary of a Wimpy Kid: Partypooper