Duchess Catherine looked stunning in a rented green off the shoulder gown paired with an emerald diamond necklace. She appeared alongside Prince William at the star-studded Earthshot event in a stunning gown borrowed from Solace London, showcasing her 'Green Goddess' style. Duchess Catherine is making a statement in sustainable fashion. Catherine wore a stunning Solace London gown, which she borrowed, to match the eco-friendly theme of the Earthshot Awards, which her husband founded.

She paired it with John Vitter Rossi embroidered heels and an Art Deco Queen Mary emerald necklace that formerly belonged to Princess Diana. The Sabina gown from Solace London was a vibrant green, off-the-shoulder, long-sleeved, cinched waist and slit. Kate's unique outfit can be rented for just £74 for four days. As she walked the green carpet, she perfectly embodied the eco-friendly theme of the Earthshot Awards in her bright green gown. Tonight is being called William's Super Bowl moment.

Catherine certainly made a statement, breaking away from her usual conservative style to shine in this striking outfit. She rented the dress from designer rental service HUR, where rental prices range from £74 to £194. While Kate's borrowed dress was more affordable than her usual haute couture outfits, she still added some sparkle with a stunning diamond and emerald necklace that once belonged to her late mother-in-law, Princess Diana.

The stunning Art Deco piece was given to Diana by the Queen, who inherited it from her grandmother, Queen Mary, and is estimated to be worth more than $15 million. When she and Prince William attended the Earthshot Awards reception in Boston on Friday night, Kate looked stunning, capping off their busy three-day tour of the United States.

While her long dark brown hair was styled in her signature waves, she pulled her hair behind her ears to highlight the off-shoulder detail of the dress. In keeping with the eco-theme, she completed her bright green outfit with Diana's diamond and emerald necklace.