Kate looked happy and radiant following Prince Louis' christening, which took place at the Chapel Royal at St James's Palace on Monday afternoon.
A day crowded with royal ceremony began with a special service in Westminster Abbey, followed by a parade in The Mall, the traditional roaring flypast over the palace, plus receptions later. Kate, who is on maternity leave until the autumn, was not confirmed to attend the service, but the mother-of-three made a surprise appearance with her husband Prince William. She paired the look with a gorgeous brooch, a matching Sean Barrett hat and nude heels.
Harry, 33, a former captain in the British Army, and Meghan, 36, cheered the RAF just hours before they were scheduled to depart Tuesday evening for Dublin, Ireland, for a 24-hour visit jam-packed with engagements, including an eagerly anticipated walkabout at Trinity College's Parliament Square on Wednesday.
It was another huge moment for Meghan, who has been adapting to life as a member of the royal family since she married Harry at Windsor Castle on May 19.
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Kate last wore the broach - once the highest award any woman of the rank could achieve - during a service for the 75th anniversary of the RAF Air Cadets in 2016.
Prince Louis Arthur Charles of Cambridge has been christened, marking his first public event since his birth on April 23.
The family has a long-standing commitment to the Royal Air Force with four generations of the family having served or trained with the United Kingdom's aerial warfare force, and many holding honorary ranks and patronages with RAF charities and associations.