Catherine, Duchess of Cambridge, 32, is big sis to Phillipa "Pippa" Middleton, 31. Older sister Kate is married to Prince William, heir to the British throne. The couple welcomed their first child, Prince George, on July 22, 2013. Pippa, who made headlines as Kate's stunning bridesmaid, wrote and published a party planning book called "Celebrate" in 2012. She currently works as a contributing editor for Vanity Fair magazine. —XFINITY Entertainment Staff (Photo by Clive Brunskill/Getty Images)
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