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LONDON, ENGLAND - JUNE 04: Sophie, Countess of Wessex and Princess Anne, Princess Royal look on as Queen Elizabeth II cuts a Women's Institute Celebrating 100 Years cake at the Centenary Annual Meeting of The National Federation Of Women's Institute at the Royal Albert Hall on June 4, 2015 in London, England. (Photo by Chris Jackson-WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 04:  Sophie, Countess of Wessex and Princess Anne, Princess Royal look on as Queen Elizabeth II cuts a Women's Institute Celebrating 100 Years cake at the Centenary Annual Meeting of The National Federation Of Women's Institute at the Royal Albert Hall on June 4, 2015 in London, England.  (Photo by Chris Jackson-WPA Pool/Getty Images)

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LONDON, ENGLAND - JUNE 04: Sophie, Countess of Wessex and Princess Anne, Princess Royal look on as Queen Elizabeth II cuts a Women's Institute Celebrating 100 Years cake at the Centenary Annual Meeting of The National Federation Of Women's Institute at the Royal Albert Hall on June 4, 2015 in London, England. (Photo by Chris Jackson-WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 04:  Sophie, Countess of Wessex and Princess Anne, Princess Royal look on as Queen Elizabeth II cuts a Women's Institute Celebrating 100 Years cake at the Centenary Annual Meeting of The National Federation Of Women's Institute at the Royal Albert Hall on June 4, 2015 in London, England.  (Photo by Chris Jackson-WPA Pool/Getty Images)