A day after the Royal Family celebrated the christening of Prince Louis, the family reunited to mark the 100th Anniversary of the Royal Air Force (RAF).
Since Kate is on maternity leave, she wasn't expected to attend the event, though Westminster Abbey confirmed she would be there when they released the order of service on their Twitter account in the early hours of Tuesday morning. That Brooch is the highest award any female cadet can receive, so it's a sweet sartorial tribute.
As the Honorary Air Commandant of the organisation it's understood the Duchess wanted to be there for the day's events, regardless of officially being on maternity leave, following the birth of Prince Louis in April. The Duchess of Cambridge was photographed wearing her second Alexander McQueen piece of the week, a pastel coat dress, with a hat by Sean Barrett and an RAF Dacre Brooch.
Prince Louis was christened at the Royal Chapel at St. James on Monday.
Ahead of the speech, the Queen presented a new flag, known as a "Colour" to the RAF Regiment.
I hope it will remain so, - said the Duchess Catherine.
Lastly, the members of the Royal Family watched a presentation of the RAF 100 Relay, which had been carried throughout the United Kingdom for the last 100 days.
Just 15 years after the first-ever powered flight undertaken by the Wright brothers, the decision to create the RAF was made after the War Cabinet inquiry criticised the poor organisation of Britain's air forces.
She was spotted on a balcony with other Royals watching the flypast.
Drawing the spectacle to a close will be the Red Arrows, who in traditional aerobatic style will stream red, white and blue smoke down the length of The Mall.