Pippa Middleton's family firm enter price war over her first book A comprehensive seasonal guide to simple and creative entertaining. Celebrate is a useful, practical and inspiring journey into British-themed occasions, focusing on tradition and ritual and the importance of bringing friends and family together," says the advert of Party Pieces "special launch offer." Including recipes, crafts, games and tips on entertaining, it will take you from Bonfire Night to New Year's Eve, Children's Parties to Barbecues and everything in between with ideas and occasions to look forward to throughout the year. Even before it hit bookshelves, the glossy hardback was already at number 70 in the online retailers' bestsellers list and is expected to be a huge success at Christmas both here and in the US. The Duchess of Cambridge's little sister reveals her top tips on everything from children's parties to making breakfast in bed: in particular, sprinkling your scrambled eggs with 'inexpensive caviar and truffle oil'. Celebrate: A year of British Festivities for Families and Friends is Pippa's first foray into publishing and one which has secured her a reported £400,000 deal from publisher Michael Joseph, an offshoot of Penguin. The glossy hardback has, however, received mixed reviews with some describing it as a romp through the blindingly obvious and others accusing her of blatantly cashing in on her royal connections. Her supporters, however, have described it as charming and well put together. The Duchess's sister, who shot to global fame when she stole the show at William and Kate's wedding in a form-fitting bridesmaid's dress, marked the publication of the 417-page tome with a party in central London today.