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Catherine, Duchess of Cambridge, smiles as she watches the procession at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 13, 2011 in Windsor. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. Membership in the order is limited to the sovereign, the Prince of Wales, and no more than 24 members. AFP PHOTO/POOL/KIRSTY WIGGLESWORTH (Photo credit should read KIRSTY WIGGLESWORTH/AFP/Getty Images)

Catherine, Duchess of Cambridge, smiles as she watches the procession at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 13, 2011 in Windsor. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. Membership in the order is limited to the sovereign, the Prince of Wales, and no more than 24 members.  AFP PHOTO/POOL/KIRSTY WIGGLESWORTH (Photo credit should read KIRSTY WIGGLESWORTH/AFP/Getty Images)