Duchess Catherine is in Luxembourg where she will be marking the 150th anniversary of the Treaty of London.
The 35-year-old royal - who has three-year-old Prince George and two-year-old daughter Princess Charlotte with husband Prince William - will kickstart her tour by commemorating the 150th anniversary of the Treaty of London, which saw the European city confirm its independence in 1867.
She will then pay a visit to the MUDAM museum where the brunette beauty will have a guided tour of exhibitions by British artists Sir Tony Cragg and Darren Almond as well as attending a reception.
She will then get a chance to see the Place Clairefontaine, a square in the heart of the city, where she will witness a cycling festival and will be introduced to the Grand Duchy's famous cycling icons.
There she will meet with children who have designed Tour de France jumpers for the tour, which arrives in the capital in July.
There she will unveil a mural of Brit cyclist Tom Simpson and Luxembourg's own Charly Gaul.
She will then be taken to the Grand Ducal Palace where she will be greeted by the Grand Duke and Grand Duchess.
Meanwhile, the British royal recently described motherhood as a "rewarding" yet "overwhelming" job.
The Duchess admitted it is a "wonderful experience" being a parent, but said it is also a "huge challenge" at times.
Speaking about motherhood at last week's launch of Heads Together charity partner Best Beginnings' 'Out of the Blue' film series - which helps to raise awareness about mental health among women and children - she said: "I would like to thank Best Beginnings for inviting me here, to introduce the 'Out of the Blue' series. This collection of films shows how important it is to be open about mental health especially in the early years of parenthood.
"Personally, becoming a mother has been such a rewarding and wonderful experience. However, at times, it's also been a huge challenge."
The Duchess said that despite being surrounded by a strong support network, she has occasionally found motherhood to be an overwhelming experience.
She shared: "Even for me, who has support at home that most mothers do not, nothing could really prepare you for the sheer overwhelming experience of what it means to become a mother."