After a dinner in honour of the fashion tycoon, she wrote: 'So much love for you @roland_mouret - love your dresses to the moon and back, but love you even more #fashion #favouritedesigner'.
"We're so pleased to be here, for our first official global visit together as a married couple, and we hope it will be the first of many!"
The Duchess of Sussex's latest sartorial statement happened during a reception at Glencairn, the residence of British ambassador Robin Barnett, where she stepped out with Prince Harry in a belted black dress by Emilia Wickstead and stylish shoes from one of her favorite designers, Aquazzura. The Dior boatneck design, (paired with a black clutch and black pumps by Aquazzura) a similar style to her bridal gown, would appear to suggest Markle is unperturbed by past criticisms about her choice of wedding dress, as well.
Dressed in a suitably green Givenchy dress, Meghan and Prince Harry were briefly greeted before taking off for their first engagement.
Prince William served a stint in the RAF Search and Rescue service in North Wales, and Prince Harry also briefly took part at RAF Shawbury.
Meghan and Harry will head straight from the service to Dublin for a two-day tour.
They will also visit the Book of Kells as well as Guinness Storehouse and the Dáil.
The smitten couple are now set to visit the world famous Croke Park Gaelic football stadium, meet locals during a walk about of Trinity College and pay their respects at the Famine Memorial.