LONDON, ENGLAND - JUNE 10: Princess Anne, Princess Royal arrives for a service of thanksgiving for Queen Elizabeth II's 90th birthday at St Paul's cathedral on June 10, 2016 in London, United Kingdom. (Photo by Ben Stansall - WPA Pool/Getty Images)
LONDON, ENGLAND - JUNE 10: Princess Anne, Princess Royal arrives for a service of thanksgiving for Queen Elizabeth II's 90th birthday at St Paul's cathedral on June 10, 2016 in London, United Kingdom. (Photo by Ben Stansall - WPA Pool/Getty Images)