Duchess of Sussex looked stunning as the Royals join the Queen for a service at Westminster Abbey to mark the centenary of the Royal Air Force

The Duke and Duchess of Sussex joined The Queen and other prominent members of the Royal family for a service at Westminster Abbey to mark the centenary of the Royal Air Force

The Duke and Duchess of Cambridge, The Duke and Duchess of Cornwall, Princess Anne and her husband Vice Admiral Sir Timothy Laurence, and Sophie The Countess of Wessex were all present for the centenary service. 

It was 100 years ago on April 1 1918 that the Royal Flying Corps and the Royal Naval Air Service merged to create the RAF - the world's first independent air service.

Following the service at Westminster Abbey, the Queen will present a new Queen's Colour to the RAF along with her son Prince Charles in the forecourt of Buckingham Palace, before she makes a brief speech.

More photos below.