The centrepiece of RAF100 is today, with a service in Westminster Abbey, followed by a parade in The Mall and spectacular flypast over Buckingham Palace.
Other female members of the royal family that donned badges included the Duchess of Cornwall, Princess Anne and Sophie, Countess of Wessex.
The Duke and Duchess of Sussex are carrying out their first joint engagement to the Republic of Ireland, with a two-day visit to Dublin.
The black dress featured her favored bateau neckline and a tailored waist accentuated by a thin belt.
Well, it seems like there is no bad blood here as the brunette beauty stunned in the gorgeous dress, especially with her softly curled tresses down for the event as she met with various prominent figures, such as Irish writer, academic and broadcaster Sinead Burke.
"I hope he stays like this", Middleton told the archbishop of Canterbury, the Rev. Justin Welby, who baptized Prince Louis in the Chapel Royal at St James' Palace.
The princes, all of whom have served in some capacity in the British armed forces in the distant or recent past, were resplendent in blue RAF uniforms while the women glowed in stylish ensembles.
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Camilla wore a white silk dress by Anna Valentine and a Philip Treacy hat.
Meetings with The President of Ireland, Michael Higgins, and with The Taoiseach, Leo Varadkar, are both planned.
The Queen, 92, was front and centre for the RAF events.
The anniversary brought the royal fab four together again.
Thousands of people lined the palace approach in central London, to watch a ceremony hosted by the Queen and culminating in the historic flypast of bombers, old and new, along with spy planes, helicopters and transporters.
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.