The thirteenth instalment in the bestselling DORK DIARIES series, now with over 45 million books in print worldwide! OMG! Nikki`s birthday party is going to be beyond awesome! Her BFFs are planning a SUPERcool pool party, with a cake, a DJ, and the perfect invitations. Organizing a big party for one hundred people is easy, right? UMMM wrong! When Mom says it`s too expensive, soon it`s looking like Nikki`s dream party will be a total dorky disaster - cringe! Can Nikki and her BFFs come up with a plan to save the day, or will there be major birthday drama?!