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LONDON, ENGLAND - JUNE 07: Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England. Corbett died in March 2016 at the age of 85. (Photo by Joe Maher/WireImage)

LONDON, ENGLAND - JUNE 07: Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England.  Corbett died in March 2016 at the age of 85. (Photo by Joe Maher/WireImage)

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LONDON, ENGLAND - JUNE 07: Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England. Corbett died in March 2016 at the age of 85. (Photo by Joe Maher/WireImage)

LONDON, ENGLAND - JUNE 07: Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England.  Corbett died in March 2016 at the age of 85. (Photo by Joe Maher/WireImage)

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LONDON, ENGLAND - JUNE 07: Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England. Corbett died in Marh 2016 at the age of 85. (Photo by Tim P. Whitby/Getty Images)

LONDON, ENGLAND - JUNE 07:  Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England.  Corbett died in Marh 2016 at the age of 85.  (Photo by Tim P. Whitby/Getty Images)

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LONDON, ENGLAND - JUNE 07: Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England. Corbett died in Marh 2016 at the age of 85. (Photo by Tim P. Whitby/Getty Images)

LONDON, ENGLAND - JUNE 07:  Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England.  Corbett died in Marh 2016 at the age of 85.  (Photo by Tim P. Whitby/Getty Images)

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LONDON, ENGLAND - JUNE 07: Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England. Corbett died in March 2016 at the age of 85. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - JUNE 07:  Sarah Ferguson, Duchess of York attends a memorial service for comedian Ronnie Corbett at Westminster Abbey on June 7, 2017 in London, England.  Corbett died in March 2016 at the age of 85.  (Photo by Mark Cuthbert/UK Press via Getty Images)