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Kate Middleton, 29, right, and her sister Pippa, 27, have become household names after Kate's historic wedding to Prince William in April. Kate tapped younger sister, Pippa Middleton, 27, left, to serve as her maid of honor. Click here for five things to know about Pippa Middleton.

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)