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LONDON, ENGLAND - JUNE 12: Catherine, Duchess of Cambridge greets guests during 'The Patron's Lunch' celebrations for The Queen's 90th birthday at The Mall on June 12, 2016 in London, England. (Photo by Jeff Spicer/Getty Images)

LONDON, ENGLAND - JUNE 12:  Catherine, Duchess of Cambridge greets guests during 'The Patron's Lunch' celebrations for The Queen's 90th birthday at The Mall on June 12, 2016 in London, England.  (Photo by Jeff Spicer/Getty Images)