The Duchess of Cambridge attended the Order of the Garter Service today at St George's Chapel in Windsor, England.

Middleton was there to support her husband Prince William as he walked in a ceremonial procession.

Order of the Garter is the senior and oldest British Order of Chivalry.  Garter Day is a symbolic occasion when holders of the honor - chosen because they have held public office, contributed to national life or served the sovereign personally - participate in a royal ceremony.