PLEASE NOTE: EDIT CONTAINS FLASH PHOTOGRAPHY 'Tis the season for Pippa Middleton to celebrate. It all started with the wedding of her sister Kate and Prince William, in which the younger Middleton's silk-cladded behind stole the hearts of millions. Now as one of the most photographed women in the world, Pippa has published her first book -- on party planning. At the private launch for her new book, appropriately titled "Celebrate", the real-life party planner pleases the crowd by showing off her enviable figure in four different outfits, including this top and skirt set from Stella McCartney's 2012 Winter Collection. The dimple-faced beauty pays homage in the book's introduction to the reasons of her meteoric rise to fame: "...on account of your sister, your brother-in-law and your bottom," it reads. Pippa was joined by her parents and brother at the launch, but Kate was nowhere to be seen. SOUNDBITE Book Author and Kate Middle's sister, Pippa Middleton, saying (English): "Really really nervous, but it's incredibly exciting and I feel really lucky to have -- be in this position to publish a book.... It's been, it's been a crazy couple of years since my sister's wedding but -- it's had its upsides and downsides and I just feel really fortunate to be able to build a career as a writer." The new book is 416 pages thick and rumoured to have earned Pippa 400,000 pounds, about 650,000 US dollars.