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.

Loading Slideshow...
  • Pippa Middleton Book Launch - London

    Pippa Middleton attending the launch of her book "Celebrate" at Daunt Books, in London.

  • Pippa Middleton Book Launch - London

    Pippa Middleton attending the launch of her book "Celebrate" at Daunt Books, in London.

  • Pippa Middleton Book Launch - London

    Pippa Middleton attending the launch of her book "Celebrate" at Daunt Books, in London.

  • Pippa Middleton Book Launch - London

    Pippa Middleton attending the launch of her book "Celebrate" at Daunt Books, in London.

  • Pippa Middleton Book Launch - London

    Pippa Middleton attending the launch of her book "Celebrate" at Daunt Books, in London.

  • Pippa Middleton book

    Pippa Middleton arrives for the launch party of her party-planning book, Celebrate, at Daunt Books in London.

  • Pippa Middleton Book Launch - London

    Pippa Middleton attending the launch of her book "Celebrate" at Daunt Books, in London.

  • Pippa Middleton book

    Pippa Middleton arrives for the launch party of her party-planning book, Celebrate, at Daunt Books in London.

  • Pippa Middleton book

    Pippa Middleton arrives for the launch party of her party-planning book, Celebrate, at Daunt Books in London.

  • Pippa Middleton book

    Pippa Middleton arrives for the launch party of her party-planning book, Celebrate, at Daunt Books in London. PRESS ASSOCIATION Photo. Picture date: Thursday October 25, 2012. Photo credit should read: Lewis Whyld/PA Wire

  • Pippa Middleton book

    Pippa Middleton arrives for the launch party of her party-planning book, Celebrate, at Daunt Books in London.

  • Pippa Middleton book

    Pippa Middleton arrives for the launch party of her party-planning book, Celebrate, at Daunt Books in London.

  • Pippa Middleton book

    Pippa Middleton arrives for the launch party of her party-planning book, Celebrate, at Daunt Books in London.

  • Pippa Middleton Book Launch - London

    Pippa Middleton attending the launch of her book "Celebrate" at Daunt Books, in London.

  • Pippa Middleton - Book Launch - Arrivals

    LONDON, ENGLAND - OCTOBER 25: Pippa Middleton attends the book launch party for Pippa Middleton's 'Celebrate: A Year Of Festivities For Family and Friends' at Daunt Books on October 25, 2012 in London, England. (Photo by Danny Martindale/Getty Images)

  • Pippa Middleton - Book Launch - Arrivals

    LONDON, ENGLAND - OCTOBER 25: Pippa Middleton attends the book launch party for Pippa Middleton's 'Celebrate: A Year Of Festivities For Family and Friends' at Daunt Books on October 25, 2012 in London, England. (Photo by Danny Martindale/Getty Images)

  • Pippa Middleton - Book Launch - Arrivals

    LONDON, ENGLAND - OCTOBER 25: Pippa Middleton attends the book launch party for Pippa Middleton's 'Celebrate: A Year Of Festivities For Family and Friends' at Daunt Books on October 25, 2012 in London, England. (Photo by Danny Martindale/Getty Images)

Loading Slideshow...
  • March 2006

  • June 2006

  • March 2007

  • May 2007

    (Getty photo)

  • July 2007

    (Getty photo)

  • June 2008

    (Getty photo)

  • July 2008

    (Getty photo)

  • September 2008

    (Getty photo)

  • September 2008

    (Getty photo)

  • June 2009

    (Getty photo)

  • October 2009

    (Getty photo)

  • December 2009

    (Getty photo)

  • January 2010

    (Getty photo)

  • February 2011

    (Getty photo)

  • April 2011

    (Getty photo)

  • April 2011

    (AP photo)

  • April 2011

    (Getty photos)

  • April 2011

    (Getty photo)

  • May 2011

    (FilmMagic photo)

  • May 2011

    (FilmMagic photo)

  • May 2011

    (FilmMagic photo)

  • May 2011

    (FilmMagic photo)

  • May 2011

    (Getty photo)

  • May 2011

    (Getty photo)

  • May 2011

    (Getty photo)

  • June 2011

    (FilmMagic photo)

  • June 2011

    (Getty photo)

  • June 2011

    (Getty photo)

  • June 2011

    (Getty photo)

  • June 2011

    (FilmMagic photo)

  • June 2011

    (Getty photo)

  • July 2011

    (Getty photo)

  • July 2011

    (FilmMagic Photo)

  • July 2011

    (FilmMagic photo)

  • August 2011

    (FilmMagic photo)

  • September 2011

    (Getty photo)

  • September 2011

    (Getty photo)

  • September 2011

    (FilmMagic photo)

  • September 2011

    (FilmMagic photo)

  • September 2011

    (FilmMagic photo)

  • September 2011

    (FilmMagic photo)

  • September 2011

    (FilmMagic photo)

  • October 2011

    (Getty photo)

  • October 2011

    (FilmMagic photo)

  • October 2011

    (FilmMagic photo)

  • October 2011

    (FilmMagic photo)

  • October 2011

    (WireImage photo)

  • October 2011

    (FilmMagic photo)

  • October 2011

    (FilmMagic photo)

  • October 2011

    (FilmMagic photo)

  • November 2011

    (Getty photo)