26/10/2012 05:53 BST | Updated 26/10/2012 06:02 BST

Pippa Middleton Changes Into Four Dresses To Launch Party Planning Book 'Celebrate'

Pippa Middleton changed outfits four times as she celebrated her book launch in London on Thursday.

The 29-year-old wore dresses by Stella McCartney, Roksanda Ilincic, Markus Lupfer and Paper London.

The Daily Mail estimates the four dresses have a combined cost at least £2,959, although it is not known if Middleton paid for them.

pippa middleton

Dressed for success: Pippa Middleton

Speaking outside the launch event in west London, she told journalists she felt "really, really nervous".

She said: "I feel incredibly lucky to be in this position to publish a book. It's been a crazy few years since my sister's wedding.

"It's had its upsides and its downsides and I feel really fortunate to build a career as a writer."

Celebrate: A Year of British Festivities for Families and Friends, has been described by publisher Michael Joseph, an offshoot of Penguin, as a book "packed with recipes, crafts and inspirational ideas"

It claims to be "a one-stop guide to entertaining throughout the British year" and aims to help readers plan a variety of events from Christmas and Easter to family birthdays, brunches and picnics.

The 416-page glossy hardback, which features photographs of Middleton engaging in party planning activities like cooking and decorating, has hit the shelves today and is on sale for £25.