LONDON, ENGLAND - DECEMBER 07:  Sophie, Countess of Wessex attends the ICAP's 24th annual charity trading day in aid of Sentebale at ICAP on December 7, 2016 in London, England.  The Sentebale charity, of which Prince Harry is Patron, supports orphans and vulnerable children in Southern Africa.  (Photo by UK Press Pool/UK Press via Getty Images)
LONDON, ENGLAND - DECEMBER 07:  Sophie, Countess of Wessex attends the ICAP's 24th annual charity trading day in aid of Sentebale at ICAP on December 7, 2016 in London, England.  The Sentebale charity, of which Prince Harry is Patron, supports orphans and vulnerable children in Southern Africa.  (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - DECEMBER 07:  Sophie, Countess of Wessex attends the ICAP's 24th annual charity trading day in aid of Sentebale at ICAP on December 7, 2016 in London, England.  The Sentebale charity, of which Prince Harry is Patron, supports orphans and vulnerable children in Southern Africa.  (Photo by UK Press Pool/UK Press via Getty Images)
LONDON, ENGLAND - DECEMBER 07:  Sophie, Countess of Wessex attends the ICAP's 24th annual charity trading day in aid of Sentebale at ICAP on December 7, 2016 in London, England.  The Sentebale charity, of which Prince Harry is Patron, supports orphans and vulnerable children in Southern Africa.  (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - DECEMBER 07:  Sophie, Countess of Wessex attends the ICAP's 24th annual charity trading day in aid of Sentebale at ICAP on December 7, 2016 in London, England.  The Sentebale charity, of which Prince Harry is Patron, supports orphans and vulnerable children in Southern Africa.  (Photo by Mark Cuthbert/UK Press via Getty Images)