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Danish Princess Mary addresses the opening of the OECD Forum on June 6, 2017 at the OECD headquarters in Paris. / AFP PHOTO / ERIC PIERMONT (Photo credit should read ERIC PIERMONT/AFP/Getty Images)

Danish Princess Mary addresses the opening of the OECD Forum on June 6, 2017 at the OECD headquarters in Paris. / AFP PHOTO / ERIC PIERMONT        (Photo credit should read ERIC PIERMONT/AFP/Getty Images)

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Danish Princess Mary addresses the opening of the OECD Forum on June 6, 2017 at the OECD headquarters in Paris. / AFP PHOTO / ERIC PIERMONT (Photo credit should read ERIC PIERMONT/AFP/Getty Images)

Danish Princess Mary addresses the opening of the OECD Forum on June 6, 2017 at the OECD headquarters in Paris. / AFP PHOTO / ERIC PIERMONT        (Photo credit should read ERIC PIERMONT/AFP/Getty Images)

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Danish Princess Mary (C) listens to OECD Secretary General's address while attending the OECD Forum 2017 opening on June 6, 2017 at the OECD headquarters in Paris. / AFP PHOTO / ERIC PIERMONT (Photo credit should read ERIC PIERMONT/AFP/Getty Images)

Danish Princess Mary (C) listens to OECD Secretary General's address while attending the OECD Forum 2017 opening on June 6, 2017 at the OECD headquarters in Paris. / AFP PHOTO / ERIC PIERMONT        (Photo credit should read ERIC PIERMONT/AFP/Getty Images)

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French president's wife Brigitte Macron shakes hands with Princess Mary of Denmark after a meeting on climate change, on June 6, 2017 at the Elysee palace in Paris. / AFP PHOTO / Christophe ARCHAMBAULT (Photo credit should read CHRISTOPHE ARCHAMBAULT/AFP/Getty Images)

French president's wife Brigitte Macron shakes hands with Princess Mary of Denmark after a meeting on climate change, on June 6, 2017 at the Elysee palace in Paris. / AFP PHOTO / Christophe ARCHAMBAULT        (Photo credit should read CHRISTOPHE ARCHAMBAULT/AFP/Getty Images)