HOUTHALEN-HELCHTEREN, BELGIUM - APRIL 21: Princess Astrid of Belgium assists the memorial of the 10 Days Campaign of 1831 on April 21, 2012 in Houthalen-Helchteren, Belgium. (Photo by Mark Renders/Getty Images)
HOUTHALEN-HELCHTEREN, BELGIUM - APRIL 21: Princess Astrid of Belgium assists the memorial of the 10 Days Campaign of 1831 on April 21, 2012 in Houthalen-Helchteren, Belgium. (Photo by Mark Renders/Getty Images)