COPENHAGEN, DENMARK - JANUARY 14: Princess Mary of Denmark and Crown Prince Frederik of Denmark hold their new-born baby twins as they leave the Rigshospitalet on January 14, 2011 in Copenhagen, Denmark. Princess Mary of Denmark gave birth to the twins, a boy and a girl on Saturday morning. (Photo by Chris Jackson/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 01: The Prince And Princess Of Wales Holding Their Baby Son, Prince William, At Home In Kensington Palace (Photo by Tim Graham Photo Library via Getty Images)
ANDERLECHT, BELGIUM - APRIL 18: In this handout photo provided by the Royal Palace, Prince Philippe of Belgium and Princess Mathilde pose for photos with their newborn baby daughter Princess Eleonore at Erasmus Hospital on April 18, 2008 in Anderlecht, Belgium. Princess Eleonore (born April 16th) is the fourth child of Princess Mathilde and Prince Philippe, and younger sister to Princess Elisabeth (R), Prince Gabriel (C) and Prince Emmanuel (2nd R). (Photo courtesy of Royal Palace via Getty Images)
