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WINDSOR, UNITED KINGDOM - JUNE 15: In A Black Velvet Hat With Ostrich Feather, Princess Alexandra, Clothed In The Heavy Traditional Robes Of The Most Noble Order Of The Garter, Sits In An Open Carriage With The Duchess Of Kent. The Blue Velvet Mantle With Hood Is Worn By All Members Of The Garter. The Chain Collar Is Made Of Alternate Gold Knots And Blue Garters Enclosing Roses, And From It Is Suspended The George Which Is The Figure Of St. George And The Dragon In Gold And Enamel. (Photo by Tim Graham Picture Library/Getty Images)

WINDSOR, UNITED KINGDOM - JUNE 15: In A Black Velvet Hat With Ostrich Feather, Princess Alexandra, Clothed In The Heavy Traditional Robes Of The Most Noble Order Of The Garter, Sits In An Open Carriage With The Duchess Of Kent. The Blue Velvet Mantle With Hood Is Worn By All Members Of The Garter. The Chain Collar Is Made Of Alternate Gold Knots And Blue Garters Enclosing Roses, And From It Is Suspended The George Which Is The Figure Of St. George And The Dragon In Gold And Enamel. (Photo by Tim Graham Picture Library/Getty Images)
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WINDSOR, UNITED KINGDOM - MARCH 09: Official Portrait Of The Royal Family On The Day Of Prince William's Confirmation. Front Left To Right - Prince William, Princess Diana, Prince William, Prince Charles And The Queen. Back Left To Right - King Constantine, Lady Susan Hussey, Princess Alexandra, Duchess Of Westminster And Lord Romsey (Photo by Tim Graham Picture Library/Getty Images)

WINDSOR, UNITED KINGDOM - MARCH 09: Official Portrait Of The Royal Family On The Day Of Prince William's Confirmation. Front Left To Right - Prince William, Princess Diana, Prince William, Prince Charles And The Queen. Back Left To Right - King Constantine, Lady Susan Hussey, Princess Alexandra, Duchess Of Westminster And Lord Romsey (Photo by Tim Graham Picture Library/Getty Images)
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LONDON, UNITED KINGDOM - JUNE 04: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) HRH Princess Alexandra of Kent attends the annual Founders Day Parade at Royal Hospital Chelsea on June 4, 2009 in London, England. (Photo by Indigo/Getty Images)

LONDON, UNITED KINGDOM - JUNE 04: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) HRH Princess Alexandra of Kent attends the annual Founders Day Parade at Royal Hospital Chelsea on June 4, 2009 in London, England. (Photo by Indigo/Getty Images)
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LONDON, UNITED KINGDOM - FEBRUARY 05: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Princess Alexandra and her brother Prince Edward, Duke of Kent attend a Service of Thanksgiving for the life of Sir Jocelyn Stevens at St Paul's Knightsbridge on February 5, 2015 in London, England. Magazine publisher and newspaper executive Sir Jocelyn Stevens died aged 82 on October 9 2014. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - FEBRUARY 05: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Princess Alexandra and her brother Prince Edward, Duke of Kent attend a Service of Thanksgiving for the life of Sir Jocelyn Stevens at St Paul's Knightsbridge on February 5, 2015 in London, England. Magazine publisher and newspaper executive Sir Jocelyn Stevens died aged 82 on October 9 2014. (Photo by Max Mumby/Indigo/Getty Images)
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LONDON, ENGLAND - NOVEMBER 29: Queen Elizabeth II and Princess Alexandra are seen during a reception to celebrate the patronages of the Princess, in the year of her 80th birthday at Buckingham Palace on November 29, 2016 in London, England. (Photo by Yui Mok - WPA Pool/Getty Images)

LONDON, ENGLAND - NOVEMBER 29: Queen Elizabeth II and Princess Alexandra are seen during a reception to celebrate the patronages of the Princess, in the year of her 80th birthday at Buckingham Palace on November 29, 2016 in London, England. (Photo by Yui Mok - WPA Pool/Getty Images)
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