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OXFORD, ENGLAND - JULY 14: Queen Letizia of Spain and King Felipe of Spain visit Exeter College during their State visit to the UK 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 Dan Kitwood/Getty Images)

OXFORD, ENGLAND - JULY 14:  Queen Letizia of Spain and King Felipe of Spain visit Exeter College during their State visit to the UK 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 Dan Kitwood/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)

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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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OXFORD, ENGLAND - JULY 14: Queen Letizia of Spain (C), bag detail, meets a group of school children as she arrives at the Weston Library during a State visit to the UK by the King and Queen of Spain 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 Dan Kitwood/Getty Images)

OXFORD, ENGLAND - JULY 14:  Queen Letizia of Spain (C), bag detail, meets a group of school children as she arrives at the Weston Library during a State visit to the UK by the King and Queen of Spain 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 Dan Kitwood/Getty Images)