Catherine, Duchess of Cambridge, 33, is big sis to Phillipa "Pippa" Middleton, 32. Older sister Kate is married to Prince William, heir to the British throne. The couple are parents to Prince George and Princess Charlotte. 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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