King Felipe VI and Queen Letizia of Spain Visit Mexico - Day 1 on June 28, 2015 in Mexico City, Mexico.

King Felipe VI (L) and Queen Letizia (R) of Spain arrive to Mexico as part of their official working visit at Mexico City International Airport on June 28, 2015 in Mexico City, Mexico.  The Spanish Monarchs are in their second state visit since the proclamation of Felipe VI as Spanish King last June 19th of 2014.

King Felipe VI (L) and Queen Letizia (R) of Spain arrive to Mexico as part of their official working visit at Mexico City International Airport on June 28, 2015 in Mexico City, Mexico.

King Felipe VI (L) and Queen Letizia (R) of Spain arrive to Mexico as part of their official working visit at Mexico City International Airport on June 28, 2015 in Mexico City, Mexico.

(L-R) Mexican President Enrique Pena Nieto, Mexican First Lady Angelica Rivera, King Felipe VI and Queen Letizia of Spain attend a ceremony at the Campo Marte military camp, in Mexico City on June 29, 2015

(L-R) Queen Letizia, King Felipe VI of Spain, Mexican President Enrique Pena Nieto, and Mexican First Lady Angelica Rivera attend a ceremony at the Campo Marte military camp, in Mexico City on June 29, 2015.

King Felipe VI (C) and Queen Letizia (R) of Spain are seen during a ceremony in which they were given the key to the city by Mexican City Mayor Miguel Mancera (out of frame) in Mexico City on June 29, 2015.

King Felipe VI (C) and Queen Letizia (R) of Spain are seen during a ceremony in which they were given the key to the city by Mexican City Mayor Miguel Mancera (out of frame) in Mexico City on June 29, 2015.

 Queen Letizia (L) and King Felipe VI (R) of Spain attend a dinner given by Mexican President Enrique Peña Nieto and his wife First Lady Angelica Rivera at National Palace on June 29, 2015 in Mexico City, Mexico

Queen Letizia (L) and King Felipe VI (R) of Spain attend a dinner given by Mexican President Enrique Peña Nieto and his wife First Lady Angelica Rivera at National Palace on June 29, 2015 in Mexico City, Mexico.

King Felipe VI of Spain gives a speech during a state dinner given by Mexican President Enrique Peña Nieto and his wife First Lady Angelica Rivera at National Palace on June 29, 2015 in Mexico City, Mexico.

King Felipe VI of Spain drinks during a state dinner given by Mexican President Enrique Peña Nieto and his wife First Lady Angelica Rivera at National Palace on June 29, 2015 in Mexico City, Mexico.

Spain's Felipe VI, left, and Mexico's President Enrique Pena Nieto, walk out to review an honor guard during a welcoming ceremony at the Campo Marte military field in Mexico City, Monday, June 29, 2015. Pictured in the background are Spanish Queen Letizia, and Mexico's first lady Angelica Rivera. The Spanish royals are in Mexico for an official four-day visit.

Spanish Queen Letizia and Mexico's first lady Angelica Rivera, talk during a welcoming ceremony at the Campo Marte military field in Mexico City, Monday, June 29, 2015.

Spanish Queen Letizia and Mexico's first lady Angelica Rivera, stand on a staging area as their husbands review an honor guard during a welcoming ceremony at the Campo Marte military field in Mexico City on June 29, 2015.

 (2L) King Felipe VI de Borbón and Queen Letizia of Spain (L) were received by Mexico's President Enrique Peña Nieto and First Lady Angelica Rivera de Peña at the National Palace of Mexico City to share a dinner in their honor.