The Duke And Duchess Of Cambridge Depart The Lindo Wing With Their Second Child [Getty Images]

LONDON, ENGLAND - MAY 02: Ê Prince William, Duke of Cambridge and Catherine, Duchess of Cambridges new baby daughter leaves St Mary's Hospital on May 2, 2015 in London, England.Ê (Photo by Mark Cuthbert/UK Press via Getty Images)

UK Press Mark Cuthbert