A comparison picture showing Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge outside the Lindo Wing of St. Mary's Hospital in London for the birth of Prince George of Cambridge (right) and the birth of the Princess of Cambridge (left). Prince George was born on July 22, 2013 and the Princess of Cambridge on May 2, 2015. The Duchess wore a Jenny Packham dress for both births. (Photo by Zak Hussein/Corbis via Getty Images)