The Sun newspaper's royal correspondent Emily Andrews was chatting with host Lorraine Kelly when she said that Prince Harry and his new wife Meghan would be meeting the "Tea set" and visiting "Crows Park" on their trip to Dublin.
This is only the second time Markle has worn colour since her May 19 wedding to Prince Harry, the first being at a reception last Thursday, for which she chose a yellow Brandon Maxwell dress. According to royal reporter, Rebecca English, the 33-year-old said, "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".
Meghan made third outfit change of the day and swapped her forest green Givenchy skirt and top ensemble for a sleeveless black dress with pockets and a belt by Emilia Wickstead.
Kate Middleton and Meghan Markle joined the princes for a service at Westminster Abbey. The Duchess also accessorised with gloves, which she could be seen carrying alongside a clutch, all in ideal tonal coordination.
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Keeping the rest of her look very simple, Meghan added diamond and gold Cartier stud earrings, which were on show with her brunette hair pulled back in a low bun.
Harry and Meghan will "meet the people of Dublin and visit organisations which are central to Irish life".
They were due to attend a summer garden party at the British Ambassador's residence in the south of the city later on Tuesday, where they will meet people from across Ireland's arts, sports, military and social enterprise sectors.