The Duchess of Cambridge is to visit Luxembourg to attend commemorations marking the 150th anniversary of a treaty that confirmed the country's independence and neutrality.
Kate will travel to the country on May 11 to attend events celebrating the 1867 Treaty of London, at the request of the Foreign and Commonwealth Office.
The visit is likely to be interpreted as another trip being made by a member of the Royal Family in their role as ''Brexit Ambassadors'', as they have been dubbed by the press.
The trip will be the Duchess's second official solo overseas visit, following her successful trip to the Netherlands last October.
Details about the visit have not been released but it is likely Kate will meet members of Luxembourg's monarchy, probably including the head of state Grand Duke Henri.
The Grand Duke and his wife Grand Duchess Maria Teresa were guests at William and Kate's wedding in 2011.
Kate visited Paris earlier this month with William in what was seen as the first in a series of European tours by the Royal Family to strengthen ties with the Continent.
The Cambridges will visit Poland and Germany in July and on Wednesday the Prince of Wales will fly to Romania, and later visit Italy and Austria with the Duchess of Cornwall, on the day Theresa May triggers the start of the UK's formal withdrawal from the EU.