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Prince William and Duchess Kate christen third child Prince Louis

GETTYThe new F-35 Lightning at RAF Marham base

They also attended the christening service of Prince Louis at the Chapel Royal at St. James' Palace on Monday. For the occasion, Kate wore an Alexander McQueen dress with a structured shoulder detail and a dramatic Jane Taylor headpiece fit for a princess.

Prince Louis wore the same christening gown as his siblings, which is a replica of the robe made for Queen Victoria's eldest daughter in 1841, which is now too delicate to be worn.

Queen Elizabeth II chats with Duchess Meghan of Sussex and Prince Harry Duke of Sussex as they watch the RAF flypast from the balcony of Buckingham Palace, July 10, 2018 in London.

Meanwhile, Kate's cousin Lucy Middleton, school friend Hannah Carter and William's pal Lady Laura Meade are Louis' godmothers.

The Duchess of Sussex looked stunning in a demure, belted black dress from Dior with her favored boatneck neckline and a wild, Stephen Jones fascinator that she makes look chic.

The Archbishop of Canterbury, Justin Welby, also married Prince Harry and Meghan Markle at their wedding last month, and called his forthcoming duty at Prince Louis' christening "very nerve wracking" but also "a great privilege".

Just 15 years after the first-ever powered flight undertaken by the Wright brothers, the Royal Flying Corps and the Royal Naval Air Service merged to create what was to become the world's first independent air service, the Royal Air Force. Her Majesty, the RAF's Air Commodore-in-Chief, presented the Queen's Colour to the RAF in the forecourt of the palace.

Up next, Harry and Meghan are jetting off to Dublin, Ireland, for an official two-day visit to the country.

Duchess of Sussex attends Royal Ascot with husband Prince Harry.

The service will be followed by a fly-by at Buckingham Palace and another balcony appearance from the royal family.

The princess does have something to look forward to: A piece of her parents' wedding cake.

Aircraft representing the RAF across the decades will then be involved in the flypast over London at 13:00 BST.