Kate Middleton closed off her three-day tour of the US with a final and especially glamorous appearance at the Earthshot Prize 2022 gala.

Held in Boston, this is the second annual Earthshot Prize ceremony, which was established by Prince William and David Attenborough to award five grants to ideas, people, and projects that aim to combat climate change.

The event was attended by a number of famous faces, including Halle and Chloe Bailey, Catherine O'Hara, and Rami Malek, who mingled with the couple at the reception.

Photo: Getty

It was the event that their tour was leading up to, as the couple spent the three days visiting organisations such as an environmental start-up incubator.

It was unsurprising, then, that Kate chose the occasion to once again send a message through her outfit.

Already renowned as a proud outfit repeater, the Princess of Wales went a step further and rented her gown from the British fashion rental site, Hurr.

The fashion industry is the second biggest polluter behind the oil industry, so Kate's choice to rent instead of buy was a clear vote in favour of sustainability.

Photo: Getty

The dress itself was, of course, another message. Kate chose a vibrant apple green column dress, the 'Sabrina', by Solace London, a sleek design that featured a sharp Bardot neckline, long sleeves, a cinched-in waist, and a slit to the back.

She amped up the glamour by wearing an eye-catching emerald and diamond choker necklace that was once owned by Princess Diana. The stunning piece features a circular central emerald flanked by smaller stones, surrounded by diamonds.

Photo: Getty

She paired this with dangling drop earrings, also featuring emeralds and diamonds. She added a final bit of sparkle with her Rania 105 Embellished Pumps by Gianvito Rossi, a glamorous pair of nude heels overlayed with silver crystal embellishments.

Her hair was worn in loose waves and parted to the side, while her makeup was glowy and fresh, with a nude lipstick tying the look together.