Prince William parties with Kate Moss, Emma Watson…

Prince William, Duke of Cambridge, speaks with Emeli Sande at a dinner to celebrate the work of The Royal Marsden at Windsor Castle. (AP)

Prince William, Duke of Cambridge and Kate Moss attend a dinner to celebrate the work of The Royal Marsden hosted by the Duke of Cambridge in Windsor, England. (Photo by Getty Images)

Prince William, Duke of Cambridge, speaks with Emma Watson at a dinner to celebrate the work of The Royal Marsden at Windsor Castle. (AP)

Prince William, Duke of Cambridge, speaks with Cate Blanchett at a dinner to celebrate the work of The Royal Marsden at Windsor Castle, England. (AP)

Prince William, Duke of Cambridge, speaks with Ralph Lauren at a dinner to celebrate the work of The Royal Marsden at Windsor Castle, England. (AP)

Prince William, Duke of Cambridge and Laura Carmichael attend a dinner to celebrate the work of The Royal Marsden hosted by the Duke of Cambridge. (Photo by Getty Images)

Ralph Lauren and his wife Ricky Anne Loew-Beer pose for photographs with members of the Lauren family as they arrive for a dinner to celebrate the work of The Royal Marsden hosted by Prince William. (AFP)

Jessica Michibata, Ralph Lauren and his wife Ricky Anne Loew-Beer (AFP)

Kate Moss and her husband Jamie Hince arrive for a dinner to celebrate the work of The Royal Marsden hosted by Prince William, the Duke of Cambridge at Windsor Castle in Windsor. (AFP)

Emma Watson poses for photographs as she arrives for a dinner to celebrate the work of The Royal Marsden hosted by Prince William, the Duke of Cambridge. (AFP)

Cara Delavigne arrives for a dinner to celebrate the work of The Royal Marsden hosted by Prince William. (AFP)

Zhang Ziyi, Margot Robbie and Editor in chief of Vogue Alexandra Shulman (AFP)

Benedict Cumberbatch, Lily James and Sophie Turner (AFP)

Helena Bonham-Carter poses for photographs as she arrives for a dinner to celebrate the work of The Royal Marsden hosted by Prince William, the Duke of Cambridge at Windsor Castle. (AFP)

Cate Blanchett arrives for a dinner to celebrate the work of The Royal Marsden hosted by Prince William. (AFP)

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