The Prince and Princess of Wales flew into Boston earlier this week ahead of the Earthshot Prize awards ceremony.
The Earthshot Prize at MGM Music Hall at Fenway celebrates "groundbreaking solutions to repair our planet."
Prince William and Princess Catherine were joined by numerous celebrities at the awards ceremony, including David Beckham, Chloe and Halle, and Ellie Goulding.
Eagle-eyed fans noticed the Princess' stunning emerald choker was previously worn by Princess Diana. The choker was gifted to Princess Diana by Queen Elizabeth as a wedding present after her marriage to Charles.
Check out all of the photos from the event below!