Guildhall Lunch Following The National Service Of Thanksgiving To Celebrate The Queen's 90th Birthday [Getty Images]

LONDON, ENGLAND - JUNE 10: Catherine, Duchess of Cambridge attends a lunch after the National Service of Thanksgiving as part of the 90th birthday celebrations for The Queen at The Guildhall on June 10, 2016 in London, England. (Photo by Jeff Spicer/Getty Images)

Getty Images Entertainment Jeff Spicer