Pippa Middleton at a Book Party For Celebrate | Pictures

Pippa Middleton toasted the launch of her entertainment guide, Celebrate: A Year of Festivities For Family and Friends, yesterday evening with a party at a London bookstore. Pippa's first title features her advice on crafts, decorating, and cooking for festive occasions. Pippa and Kate Middleton's parents have run a successful event-planning company since the girls were young, and Pippa has said that many of her party tips were inspired by her childhood.

Last night's soiree capped off a busy day for Pippa, who visited several bookshops to hype her new title. On one stop, she guided a group of schoolchildren through some Halloween-themed crafts. The new author had a laugh when, during a discussion about tomboys and the color pink, one little girl informed Pippa that she "hates princesses." Pippa took the clearly unintentional jab it in stride, joking, "Better not talk about that one!" Meanwhile, Kate kept busy this week with her royal duties, attending a reception for Team GB Olympic and Paralympic medalists at the palace on Tuesday.