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Pippa Middleton, sister to the Duchess of Cambridge, formerly known as Kate Middleton, poses for the media as she arrives at a bookshop to promote her new book "Celebrate: A Year of British festivities for families and friends", in London Thursday, Oct. 25, 2012. (AP Photo/Kirsty Wigglesworth)

Pippa Middleton

Pippa Middleton, sister of Catherine, Duchess of Cambridge, will write a column for the upmarket chain's monthly magazine, Waitrose Kitchen, called "Pippa's Friday Night Feasts." (Reuters)