It's a busy week for the Duke and Duchess of Sussex. Just a day after Prince Louis' christening, the couple attended a service to mark the centenary of the Royal Air Force at Westminster Abbey on Tuesday morning.

Meghan was dressed in a black Dior dress with a bateau neckline (similar available here), which has been favoured by the Duchess ever since she wore the off-the-shoulder style on her wedding day.

The dress was initially rumoured to have been a Givenchy number by creative director Clare Waight Keller.

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She paired the timeless design with a veiled Stephen Jones headpiece, diamond stud earrings by Cartier and classic nude court shoes.

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The newlyweds arrived at the Abbey alongside the Duke and Duchess of Cambridge. Kate contrasted from Meghan in a duck egg blue Alexander McQueen coat dress, while William attended in his RAF uniform.

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After the service, the couples are due to join the Queen and members of the royal family on the balcony of Buckingham Palace to watch an impressive flypast in celebration of the RAF's anniversary. Featuring up to 100 aircraft, the aerial display will mark the RAF's creation on 1 April, 1918.

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Harry and Meghan won't be able to stick around for too long, though. They are due to fly to Dublin later in the afternoon for their two-day visit to Ireland. It will be their first overseas trip as a married couple.

Get Meghan's RAF Centenary Service look:

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Valentino off-the-shoulder silk-crepe dress, £900

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Coast black 'Valentina' sculptured fascinator, £59