Britain's Prince William and Catherine, Duchess of Cambridge, pose for a formal photo with Princess Martha Louise of Norway, Harald V of Norway, Queen Sonja of Norway, Crown Prince Haakon of Norway, Crown Princess Mette-Marit of Norway and Princess Astrid of Norway ahead of a dinner at the Royal Palace in Oslo, Norway, February 1, 2018. Picture taken February 1, 2018. REUTERS/Chris Jackson/Pool