The thirteenth instalment in the bestselling DORK DIARIES series, now with over 45 million books in print worldwide! OMG! Nikkis 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 its too expensive, soon its looking like Nikkis 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?!Other books in the DORK DIARIES series: Book 1:Dork Diaries Book 2:Party Time Book 3:Pop Star Book 3 1/2:How to Dork Your Diary Book 4:Skating Sensation Book 5:Dear Dork Book 6:Holiday Heartbreak Book 7:TV Star Book 8:Once Upon a Dork Book 9:Drama Queen Book 10:Puppy Love Book 11:Frenemies Forever Book 12:Crush Catastrophe Book 14:Spectacular Superstar Book 15: I Love Paris!-Coming soon!