Prince William and Kate attend Earthshot Prize with David Beckham.

Friday's Earthshot Prize ceremony concluded Prince William and Princess Kate's quick journey to Boston.

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Final day of Princess Kate's Boston tour: finest images

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David Beckham, Catherine O'Hara, Rami Malek, and Billie Eilish presented awards and funded environmental projects at the event.

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After the wedding, former footballer David kissed Princess Kate on the cheek.

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In other photos, William and Kate laughed with singer Chloe and Halle Bailey and their friend Ellie Goulding, who sang at their 2011 wedding.

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Prince William and Princess Kate lead star-studded Earthshot Awards celebration.

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"When I launched this Prize in 2020, it was with the intention to harness the same spirit of creativity, that inspired President John F.," William said to open the ceremony.

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Kennedy will dare the US to send a man to the moon in a decade. So, it's been an honor to share our Earthshot winners and finalists' stories from his homeland."

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He said, "The Earthshot solutions you saw this evening prove we can tackle our planet's toughest issues, and by supporting and scaling them we can alter our future."

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"Alongside tonight's winners and finalists, and others still to be identified, it's my hope the Earthshot legacy will continue to flourish, helping our communities and planet thrive."

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