The 28-year-old younger sister to the Duchess of Cambridge, formerly known as Kate Middleton, says that the book is based on her experience in her family's party business and work in an events company.
She said that "Celebrate: A Year of British Festivities for Families and Friends" is a "feel-good book" with practical tips on how to host British-themed parties, including recipes, crafts and games.
Penguin, the book's publisher, said Thursday the book will come out in late October.
Pippa Middleton became a celebrity in Britain after her turn as bridesmaid during Prince William's wedding to her sister in April last year.
