Princess Eugenie and Princess Beatrice attended an anti-trafficking event in Switzerland this week.
The princess, who co-founded The Anti-Slavery Collective in 2017, spoke at the event in Davos, Switzerland, alongside former British Prime Minister Theresa May.
Their discussion took place to highlight the importance of tackling modern slavery in every corporate industry.
Eugenie said: "Guns and drugs can be only trafficked once but human beings are trafficked again and again and again.
Princess Eugenie and Princess Beatrice attend anti-trafficking event in Switzerland
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"For them, it happens every day and minute."
Princess Beatrice was also present at the event to support her sister on Tuesday.
Eugenie, 33, will be a discussion leader at a World Economic Forum event today.
The Princess of York will discuss the harmful impacts of trafficking and modern slavery, a subject on which she is very knowledgeable.
Princess Eugenie and Princess Beatrice pictured in Switzerland
The couple also brought their two children, August, two, and their seven-month-old baby Ernest.
Pictures of the couple on holiday were posted on social media by Brendan Fallis, the husband of US influencer Hannah Bronfman.
The post was captioned "When traditions begin," where Eugenie and Jack could be seen smiling at the camera.
Princess Eugenie photographed with Theresa May in Switzerland
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Princess Beatrice travelled to Switzerland to support her sister Eugenie
In another photo, Eugenie held Ernest among three other friends with their children.
Eugenie looked happy in the photographs as she posed beside a palm tree, while dressed in a towel and linen shirt.
The Princess of York was pictured driving herself through the gates of the Royal Lodge.
