One thing everyone in Britain can agree on: Pippa Middleton knows how to party. So Middleton — the sister of Kate, the Duchess of Cambridge — was marking the release of her new book, ‘‘Celebrate,’’ with a private launch party Thursday night, posing outside Daunt Books in west London. ‘‘Celebrate’’ is Middleton’s guide to home entertaining. It draws on her experiences working with her parents’ business, Party Pieces, and a London-based events company. (AP)

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