LONDON, ENGLAND - JUNE 10: Lady Louise Windsor attends a National Service of Thanksgiving as part of the 90th birthday celebrations for The Queen at St Paul's Cathedral on June 10, 2016 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
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UK Press Mark Cuthbert

LONDON, ENGLAND - JUNE 10: Lady Louise Windsor 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)
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Getty Images Entertainment Jeff Spicer

LONDON, ENGLAND - JUNE 10: Lady Louise Windsor and Sophie, Countess of Wessex attend a National Service of Thanksgiving as part of the 90th birthday celebrations for The Queen at St Paul's Cathedral on June 10, 2016 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
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UK Press Mark Cuthbert