LONDON, ENGLAND - JULY 23:  Michael and Carole Middleton depart after visiting the Duke and Duchess of Cambridge and their newborn baby son at the Lindo Wing, St Mary's Hospital on July 23, 2013 in London, England. Catherine, Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William, Duke of Cambridge at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge.  (Photo by Danny Martindale/WireImage)