Did you notice?
Born His Royal Highness Prince Louis Arthur Charles of Cambridge, Louis is the third and youngest child of Prince William and Princess Kate, and the younger brother of Prince George and Princess Charlotte. His middle name is a tribute to his grandfather King Charles.
As a member of the British royal family, Louis is fourth-in-line to the throne. While he has only made a few public appearances with his family, including at Trooping the Colour, the late Queen's Platinum Jubilee, the King's coronation, and Christmas Day at Sandringham, young Louis never fails to entertain royal watchers with his fun antics.