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OXFORD, UNITED KINGDOM - JULY 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Letizia of Spain visits the Weston Library at Oxford University on the final day of the Spanish State Visit to the United Kingdom on July 14, 2017 in Oxford, England. 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 Max Mumby/Indigo/Getty Images)

OXFORD, UNITED KINGDOM - JULY 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Letizia of Spain visits the Weston Library at Oxford University on the final day of the Spanish State Visit to the United Kingdom on July 14, 2017 in Oxford, England.  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 Max Mumby/Indigo/Getty Images)

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LONDON, UNITED KINGDOM - JULY 14: Queen Letizia of Spain visits the Francis Crick Institute during a State visit by the King and Queen of Spain on July 14, 2017 in London. 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 Mark Cuthbert/UK Press via Getty Images)

LONDON, UNITED KINGDOM - JULY 14:  Queen Letizia of Spain visits the Francis Crick Institute during a State visit by the King and Queen of Spain on July 14, 2017 in London. 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 Mark Cuthbert/UK Press via Getty Images)

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OXFORD, UNITED KINGDOM - JULY 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Letizia of Spain meets school children as she visits the Weston Library at Oxford University on the final day of the Spanish State Visit to the United Kingdom on July 14, 2017 in Oxford, England. 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 Max Mumby/Indigo/Getty Images)

OXFORD, UNITED KINGDOM - JULY 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Letizia of Spain meets school children as she visits the Weston Library at Oxford University on the final day of the Spanish State Visit to the United Kingdom on July 14, 2017 in Oxford, England.  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 Max Mumby/Indigo/Getty Images)