MADRID, SPAIN - MARCH 12: King Felipe VI of Spain and Queen Letizia of Spain (C) attend a Tribute Concert for Terrorism Victims at the National Auditorium on March 12, 2015 in Madrid, Spain. (Photo by Carlos Alvarez/Getty Images)
MADRID, SPAIN - MARCH 12: King Felipe VI of Spain and Queen Letizia of Spain (C) attend a Tribute Concert for Terrorism Victims at the National Auditorium on March 12, 2015 in Madrid, Spain. (Photo by Carlos Alvarez/Getty Images)