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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 and King Felipe VI of Spain meet 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 and King Felipe VI of Spain meet 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, ENGLAND - JULY 14: Queen Letizia of Spain is shown exhibits during a visit to the Weston Library 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 Chris J Ratcliffe - WPA Pool/Getty Images)

OXFORD, ENGLAND - JULY 14: Queen Letizia of Spain is shown exhibits during a visit to the Weston Library 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 Chris J Ratcliffe - WPA Pool/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) King Felipe VI of Spain and Queen Letizia of Spain visit 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) King Felipe VI of Spain and Queen Letizia of Spain visit 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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Getty Images Entertainment Max Mumby/Indigo