My Little Pony-Pony Party Book Book is by Kate Egan and Illustrated by Carlo LoRaso This book is by HarperFestival (Division of Harper Collins Publisher)! The book has 23 pages with colorful pages (See photos) Here is a description about the book-It’s a day of the big costume party-what is Pinkie going to wear? She dresses up as a beautiful Unicorn, but when she gets to the party everything goes wrong! Pinkie Pie’s outfit is ruined. Where is Pinkie Pie’s friends find another costume that is just right for her?