Kate Middleton Surprises in a Rented Designer Dress at Earthshot Prize Awards in Boston!

Kate Middleton Surprises in a Rented Designer Dress at Earthshot Prize Awards in Boston!
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Kate Middleton and Prince William made a glam entrance at the Earthshot Prize Awards ceremony in Boston.

To end their three-day visit to the United States, the Prince and Princess of Wales attended the second annual prize ceremony at the MGM Music Hall on Friday. In keeping with the event's earth-friendly theme, guests were asked not to purchase new dresses or suits for the evening.

Kate adhered to the sustainable fashion guidelines in a bright green off-the-shoulder gown by Solace London, which she rented from HURR, a rental platform in the U.K. for designer dresses. She accessorized her look with the ultimate rewear — an emerald and diamond choker that belonged to Princess Diana. She also wore halo emerald and diamond earrings mounted in platinum by Asprey.

BOSTON, MASSACHUSETTS - DECEMBER 02: Catherine, Princess of Wales and Prince William, Prince of Wales attend The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Samir Hussein/WireImage)
BOSTON, MASSACHUSETTS - DECEMBER 02: Catherine, Princess of Wales and Prince William, Prince of Wales attend The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Samir Hussein/WireImage)

Mike Coppola/Getty Kate Middleton and Prince William

RELATED: Earthshot Prize CEO Says Prince William 'Only Gets More Ambitious' Each Year: 'He Really Cares'

William opted for a rewear with his blue velvet blazer, which he's worn to past royal events.

BOSTON, MASSACHUSETTS - DECEMBER 02: Catherine, Princess of Wales and Prince William, Prince of Wales attend The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Samir Hussein/WireImage)
BOSTON, MASSACHUSETTS - DECEMBER 02: Catherine, Princess of Wales and Prince William, Prince of Wales attend The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Samir Hussein/WireImage)

Samir Hussein/WireImage Kate Middleton and Prince William

The five winners from across Earthshot's five categories will each receive $1 million in grants to go toward their project's goals. The winners, which were announced on Friday night, are: Mukuru Clean Stoves from Kenya; Kheyti from India; Indigenous Women of the Great Barrier Reef from Australia; Notpla from the United Kingdom and 44.01 from Oman.

Britain's Prince William, Prince of Wales, and Catherine, Princess of Wales, arrive for the 2022 Earthshot Prize ceremony at the John F. Kennedy Presidential Library and Museum in Boston, Massachusetts, December 2, 2022. (Photo by ANGELA WEISS / AFP) (Photo by ANGELA WEISS/AFP via Getty Images)
Britain's Prince William, Prince of Wales, and Catherine, Princess of Wales, arrive for the 2022 Earthshot Prize ceremony at the John F. Kennedy Presidential Library and Museum in Boston, Massachusetts, December 2, 2022. (Photo by ANGELA WEISS / AFP) (Photo by ANGELA WEISS/AFP via Getty Images)

ANGELA WEISS/AFP Kate Middleton and Prince William

Prizes will be awarded by Emmy-winning actor and James Bond villain Rami Malek, comedian Catherine O'Hara and actor and activist Shailene Woodley. Like last year, Princess Kate will also hand out one of the prestigious prizes. David Beckham will also present. Actor Daniel Dae Kim is co-hosting the awards alongside BBC Radio 1's Clara Amfo.

BOSTON, MASSACHUSETTS - DECEMBER 02: Catherine, Princess of Wales and Prince William, Prince of Wales attend The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Samir Hussein/WireImage)
BOSTON, MASSACHUSETTS - DECEMBER 02: Catherine, Princess of Wales and Prince William, Prince of Wales attend The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Samir Hussein/WireImage)

Samir Hussein/WireImage Kate Middleton and Prince William

Malek revealed Prince William first raised the subject of the Earthshot Prize with him at a movie premiere.

For more on Kate Middleton and Prince William, listen below to our daily podcast PEOPLE Every Day.

"We first broached the subject at the Bond premiere. I was just so impressed with the spirit he put forward," he tells PEOPLE on the green carpet. "And speaking with Sir David Attenborough and [William's] affinity for the Moonshot and what President Kennedy did. I grew up being very inspired by President Kennedy, so we had a discussion about that."

BOSTON, MASSACHUSETTS - DECEMBER 02: Catherine, Princess of Wales attends The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Karwai Tang/WireImage)
BOSTON, MASSACHUSETTS - DECEMBER 02: Catherine, Princess of Wales attends The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Karwai Tang/WireImage)

Karwai Tang/WireImage Kate Middleton

"And here we are in a place that is far beyond that and I applaud Prince William and everyone who can come together to find innovative solutions to help resolve this global crisis because it can be resolved when we all put our minds together," he says.

BOSTON, MASSACHUSETTS - DECEMBER 02: the The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Mike Coppola/Getty Images)
BOSTON, MASSACHUSETTS - DECEMBER 02: the The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Mike Coppola/Getty Images)

Samir Hussein/WireImage Rami Malek

Speaking to PEOPLE, Daniel Dae Kim said the Earthshot Prize is "much more substantive. It deals with an existential issue that we're all having as a species, not just an industry. I'm proud that they've asked me to be part of it."

US actor Daniel Dae Kim arrives at the Earthshot Prize awards at the MGM Music Hall in Boston, Massachusetts on December 2, 2022. (Photo by Joseph Prezioso / AFP) (Photo by JOSEPH PREZIOSO/AFP via Getty Images)
US actor Daniel Dae Kim arrives at the Earthshot Prize awards at the MGM Music Hall in Boston, Massachusetts on December 2, 2022. (Photo by Joseph Prezioso / AFP) (Photo by JOSEPH PREZIOSO/AFP via Getty Images)

jOSEPH PREZIOSO/AFP Daniel Dae Kim

Amfo, who is sharing co-hosting duties with Dae Kim, tells PEOPLE of the couple: "As somebody who's worked in television for a while, I can confidently say they're both very good presenters. I know they're very excited and really galvanized to get everyone interested in this. Of course, we're celebrating the winners but again it's about us having an influence and letting people know we call all do better."

BOSTON, MASSACHUSETTS - DECEMBER 02: the The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Mike Coppola/Getty Images)
BOSTON, MASSACHUSETTS - DECEMBER 02: the The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Mike Coppola/Getty Images)

Samir Hussein/WireImage David Beckham

There's also some A-list entertainment in store — the event will feature performances by Billie EilishAnnie Lennox, Chloe x Halle and Ellie Goulding (who performed at Kate and William's 2011 wedding reception).

"It means so much to us being here," Chloe tells PEOPLE. "Me and my sister have been vegan for 11 years. This whole message rings true. We're so happy to be here and be able to sing.

"We haven't met the couple yet. But we're excited to do so. We hope they're enjoying it over here and happy," Chloe says, adding that they had been briefed on royal protocol. "We don't want to say the wrong thing!"

BOSTON, MASSACHUSETTS - DECEMBER 02: the The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Mike Coppola/Getty Images)
BOSTON, MASSACHUSETTS - DECEMBER 02: the The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Mike Coppola/Getty Images)

Mike Coppola/Getty Chloe Bailey and Halle Bailey

The show will feature packages voiced by Sir David Attenborough as well as Oscar-winning actor and Earthshot Prize Council member Cate Blanchett, who will talk about the successes of the inaugural winners.

In a speech at the ceremony, Prince William said: "I believe that the Earthshot solutions you have seen this evening prove we can overcome our planet's greatest challenges. And by supporting and scaling them we can change our future."

"The decisions we make now will affect generations to come," he said. "Which is why we must choose the path of hope, optimism, and urgency to repair our planet."

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BOSTON, MASSACHUSETTS - DECEMBER 02: Shailene Woodley attends the The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Mike Coppola/Getty Images)
BOSTON, MASSACHUSETTS - DECEMBER 02: Shailene Woodley attends the The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Mike Coppola/Getty Images)

Mike Coppola/Getty Shailene Woodley

The Prince of Wales refers to the Earthshot Prize Awards — which he created in 2020 — as his attempt to provide some urgent optimism about tackling environmental issues and climate change. He and Princess Kate are "excited to be able to bring that to the United States and inspire people stateside and around the world through the incredible stories we are going to tell," a source close to the couple tells PEOPLE.

BOSTON, MASSACHUSETTS - DECEMBER 02: Ellie Goulding attends The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Samir Hussein/WireImage)
BOSTON, MASSACHUSETTS - DECEMBER 02: Ellie Goulding attends The Earthshot Prize 2022 at MGM Music Hall at Fenway on December 02, 2022 in Boston, Massachusetts. (Photo by Samir Hussein/WireImage)

Samir Hussein/WireImage Ellie Goulding

The source adds, "The prize has become the Prince's Super Bowl moment of the year, and he looks forward to continuing to use the platform each year to shine a light on some of the most impactful projects doing amazing things around the world to save our planet's future."