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LONDON, ENGLAND - APRIL 07: (L-R) Serena Armstrong-Jones, David Armstrong-Jones, Margarita Armstrong-Jones, Queen Elizabeth II, Prince Philip, Duke of Edinburgh and Sarah Chatto leave a Service of Thanksgiving for the life and work of Lord Snowdon at Westminster Abbey on April 7, 2017 in London, United Kingdom. (Photo by Hannah McKay - WPA Pool /Getty Images)

LONDON, ENGLAND - APRIL 07: (L-R) Serena Armstrong-Jones, David Armstrong-Jones, Margarita Armstrong-Jones, Queen Elizabeth II, Prince Philip, Duke of Edinburgh and Sarah Chatto leave a Service of Thanksgiving for the life and work of Lord Snowdon at Westminster Abbey on April 7, 2017 in London, United Kingdom.  (Photo by Hannah McKay - WPA Pool /Getty Images)

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LONDON, ENGLAND - APRIL 07: Britain's Queen Elizabeth II speaks to (L-R) Serena Armstrong-Jones, David Armstrong-Jones and Margarita Armstrong-Jones as they leave a Service of Thanksgiving for the life and work of Lord Snowdon at Westminster Abbey on April 7, 2017 in London, United Kingdom. (Photo by Justin Tallis - WPA Pool /Getty Images)

LONDON, ENGLAND - APRIL 07: Britain's Queen Elizabeth II speaks to (L-R) Serena Armstrong-Jones, David Armstrong-Jones and Margarita Armstrong-Jones as they leave a Service of Thanksgiving for the life and work of Lord Snowdon at Westminster Abbey on April 7, 2017 in London, United Kingdom.  (Photo by Justin Tallis - WPA Pool /Getty Images)