While seated for the ceremony, the Duchess of Cambridge appeared to catch her husband laughing to himself in an adorable moment that was captured on camera.
The royal family celebrating the Royal Air Force's 100th anniversary.
Her choice of Givenchy is an unsurprising one since she has become an ardent champion of the French fashion house under Claire Waight Keller's creative direction in recent months, and famously wore her custom design on her wedding day.
"We're so pleased to be here, for our first official worldwide visit together as a married couple, and we hope it will be the first of many!"
Prince William and Prince Harry were decked out in their military finest. Meetings with The President of Ireland, Michael Higgins, and with The Taoiseach, Leo Varadkar, are both planned.
Meghan and Harry have a busy day ahead of them, with a visit to Croke Park, the home of Ireland's largest sporting organization - the Gaelic Athletic Association.
At the garden party at the British Ambassador's residence at Glencairn yesterday evening, Meghan wore a chic black dress by New Zealand-born designer Emilia Wickstead.
During their visit to Dublin, Their Royal Highnesses will learn about Ireland's culture and heritage, including a visit to Trinity College, where they will see the Book of Kells, one of Ireland's greatest cultural treasures.
Other visits include DogPatch Labs to meet youth learning coding through free workshops.