William and Kate will undertake engagements in Belfast, Balleymena and County Fermanagh, all of which will largely focus on the young people of Northern Ireland.
The Duchess of Cambridge opted for a very fitting all-blue ensemble as she joined William to meet police officers and staff at Hillsborough Castle where they discussed the challenging roles they undertake.
Several hundred people lined the streets of the Co Antrim town as William and Kate went on a walkabout.
Kate, 37, started the day in a £1,200 Carolina Herrera coat and £199 LK Bennett boots, but soon swapped them for a £159 navy Barbour jacket and £80 New Balance trainers which proved a more practical choice.
She accessorised with a small nude clutch, her trademark nude heels and minimal makeup to let the gúna do all the talking.
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Despite her dress costing a whopping £1,590, the mother-of-three wasn't afraid to get a bit dirty as she jumped behind the bar to pour her own pint of Harp Ice at the reception for young leaders at the entertainment venue.
The couple tried out some of the 50 activities available to children there who come from 22 counties of Ireland every year including canoeing and archery.
The last engagement today for William and Kate will take place back in Belfast where they will attend a party at the Empire Music Hall in celebration of many young people from across Northern Ireland.
Middleton could only reply with a laugh, suggesting her husband Prince William would be "worried".