BRUSSEL, BELGIUM - DECEMBER 17: Princess Claire and Princess Astrid of Belgium attend the Xmas Concert at the Royal Palace on December 17, 2014 in Brussel, Belgium. (Photo by Mark Renders/Getty Images)
BRUSSEL, BELGIUM - DECEMBER 17: Princess Claire and Princess Astrid of Belgium attend the Xmas Concert at the Royal Palace on December 17, 2014 in Brussel, Belgium. (Photo by Mark Renders/Getty Images)