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LONDON, UNITED KINGDOM - JULY 13: King Felipe of Spain and Queen Letizia of Spain walk through the nave with Dean of Westminster Dr John Hall during a State visit by the King and Queen of Spain at Westminster Abbey on July 13, 2017 in London, United Kingdom. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Francisco Gomez - Pool/Getty Images)

LONDON, UNITED KINGDOM - JULY 13:  King Felipe of Spain and  Queen Letizia of Spain walk through the nave with Dean of Westminster Dr John Hall during a State visit by the King and Queen of Spain at Westminster Abbey on July 13, 2017 in London, United Kingdom. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Francisco Gomez - Pool/Getty Images)

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LONDON, UNITED KINGDOM - JULY 13: Queen Letizia of Spain signs the visitors' book watched by her husband King Felipe of Spain and Dean of Westminster Dr John Hall during a State visit by the King and Queen of Spain at Westminster Abbey on July 13, 2017 in London, United Kingdom. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Francisco Gomez - Pool/Getty Images)

LONDON, UNITED KINGDOM - JULY 13: Queen Letizia of Spain signs the visitors' book watched by her husband  King Felipe of Spain and Dean of Westminster Dr John Hall  during a State visit by the King and Queen of Spain at Westminster Abbey on July 13, 2017 in London, United Kingdom. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Francisco Gomez - Pool/Getty Images)

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LONDON, UNITED KINGDOM - JULY 13: Queen Letizia of Spain, Prince Harry, King Felipe of Spain and Dean of Westminster Dr John Hall during a State visit by the King and Queen of Spain at Westminster Abbey on July 13, 2017 in London, United Kingdom. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Francisco Gomez - Pool/Getty Images)

LONDON, UNITED KINGDOM - JULY 13: Queen Letizia of Spain, Prince Harry, King Felipe of Spain and Dean of Westminster Dr John Hall during a State visit by the King and Queen of Spain at Westminster Abbey on July 13, 2017 in London, United Kingdom. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Francisco Gomez - Pool/Getty Images)