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LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal jokes with Normandy veteran George Joseph White, 95, of the Queen's Royal Artillery, during a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal jokes with Normandy veteran George Joseph White, 95, of the Queen's Royal Artillery, during a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)

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LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal with Normandy veteran Gordon Smith, 92, of the Royal Engineers, and his partner Wendy Plant, 80, during a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal with Normandy veteran Gordon Smith, 92, of the Royal Engineers, and his partner Wendy Plant, 80, during a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)

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LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal attends a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal attends a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)

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LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal attends a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal attends a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)

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LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal shakes hands with actress Pam St Clement during a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 8: Princess Anne, Princess Royal shakes hands with actress Pam St Clement during a Christmas Party at St James's Palace for The Not Forgotten Association - a national tri-service charity which provides entertainment, leisure and recreation for the serving wounded, injured or sick and for ex-service men and women with disabilities on December 8, 2016 in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)