Simon Cowell and Lauren Silverman spent the evening with the Prince of Wales discussing human trafficking and the devastating impact it has on women and girls.
They attended the British Asian Trust dinner with the Prince and Duchess of Cornwall.
The royals were joined by more than 300 guests at the event staged at Banqueting House in London's Whitehall.
At the event, Charles announced the organisation would be launching an anti-trafficking fund to target the problem.
A film was played to the guests, highlighting the stories of two individuals who had survived trafficking.
The Queen's eldest son spoke after the clip, saying: "Hearing of the horrific ordeals these young girls suffered is heart-breaking, but I was so very struck by their tremendous courage and could not be more encouraged by the local organisations working tirelessly to rescue, care for and rehabilitate women and children who have been victims of this appalling practice."
The Prince, who is the Trust's president, added: "As you can perhaps imagine, I am extremely proud that my British Asian Trust is making its own contribution to these overall efforts by this year launching its Anti-Trafficking Fund, which I hope will help in a small way to prevent and address violence against women and children."
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