Irwin and Buckey went public with their relationship in July
The couple attended the 2023 Earthshot Prize in Singapore which celebrates innovative efforts to combat climate change on Tuesday.
Irwin and Buckey, both 19, appeared to be in great spirits at the ceremony. The conservationist and zookeeper looked smart in a black suit and white shirt, while Buckey wore a floral dress with a silver purse.
The Earthshot Prize, which was conceived by Prince William in 2008, sees five people awarded for their efforts to combat climate change. And this year's event marks the Prince of Wales' first time in Singapore in 11 years.
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During the event, the royal was pictured shaking Irwin's hand as the pair exchanged welcoming smiles. Prior to the ceremony, Irwin had exclusively revealed to PEOPLE that Prince William's impact on environmental issues couldn't be underestimated.
“It’s hard to put into words just how massive Earthshot is for wildlife conservation, for climate action, for the world," he said. "For Prince William, who has such a great platform, to lend his voice, his resources into creating positive change is such a refreshing, wonderful thing to see. I applaud what he is doing."
Buckey and Irwin's went public with their relationship in July when they attended the Sydney premiere of Mission: Impossible - Dead Reckoning Part One together. In September, Irwin - who is the son of the late Steve Irwin - also shared a carousel post of the couple painting together.
In October, Bindi also shared a photo of friends and family, which included Buckey. "My brother’s gorgeous girlfriend, @roriebuckey," she wrote in the caption. "Sweetest soul, beautiful friend, I love her dearly and you’ll usually see Grace just following her around because she adores her."
“R&R take on NYC!! 🌟,” she wrote under a black and white boomerang of the duo, while Irwin commented, “I love you!!! ☺️❤️."
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