LONDON, UNITED KINGDOM - MARCH 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends the Commonwealth Observance Day Service at Westminster Abbey on March 14, 2016 in London, England. The service is the largest annual inter-faith gathering in the United Kingdom and will celebrate the Queen's 90th birthday. Kofi Annan and Ellie Goulding will take part in the service. (Photo by Max Mumby/Indigo/Getty Images)