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

The Prince and Princess of Wales are ending their three-day tour to Boston with a spectacular environmental heroes awards event.

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Kate Middleton and Prince William arrived in style to the Boston Earthshot Prize Awards.

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On Friday, the Prince and Princess of Wales visited the MGM Music Hall's second annual prize presentation to conclude their three-day US visit.

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The event's eco-friendly concept required visitors to wear secondhand clothes.

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Kate hired a bright green off-the-shoulder Solace London gown from U.K. designer dress rental site HURR to follow sustainable fashion principles.

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She wore Princess Diana's emerald and diamond choker.

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Asprey platinum halo emerald and diamond earrings adorned her.

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