Meghan, Duchess of Sussex switched up her outfit for her second look of the day!
The whistlestop 24-hour visit is their first official overseas trip as a married couple, with the Foreign Office hoping it will underscore the importance of maintaining good relations throughout and after the Brexit process.
Kate also remained loyal to her classic look, wearing an elegant McQueen dress once again for the occasion.
It comes "at the request of Her Majesty's Government", a spokesperson for Kensington Palace said.
This evening, Prince Harry will accompany his American bride to a summer party at the British Ambassador's residence, with the guestlist including members of the Irish arts, sporting, military and social enterprise communities.
Later, they will take part in a Gaelic sports festival where traditional Irish sports like hurling, camogie and rounders will be played.
They will also visit a number of Dublin's main cultural attractions, including the Irish Emigration Museum, EPIC - where the Duchess will learn about her Irish ancestry.
Other visits include DogPatch Labs to meet youth learning coding through free workshops.
Even before leaving for Ireland, it has been a busy week for the newlyweds.
Kate, dressed in an ivory dress and matching hat, and William were joined by William's father Prince Charles and his wife Camilla, along with younger brother Prince Harry and his wife Meghan, Duchess of Sussex.
Although seemingly keeping their hands apart for the church service and their appearance on the Buckingham Palace balcony, the couple couldn't keep their eyes off one another.
The Archbishop of Canterbury, the Most Rev. Justin Welby, presided over Louis' christening, just as he did for Meghan's baptism and confirmation.