Kate donned a lilac Alexander McQueen dress that she previously wore in 2011, while William followed suit, re-wearing a dark green velvet blazer he wore for a charity gala in 2019 which he paired with 20-year-old trousers.
Harry Potter star, Emma Watson also walked the green carpet, wearing an outfit made of 10 recycled dresses from Oxfam.
Dame Emma Thompson jumped on the recycling outfit trend, re-wearing the same blue suit and white trainer look that she wore in 2018 when she received her damehood.
BBC Radio 1 presenter, Clara Amfo stunned in an all-white suit with colourful patches. Amfo said at the awards: ”It’s all about thinking differently, it is also about remembering how we used to live – we never used to live like this. We’ve only been mad for about 60 years.
“If we had shown my parents how people live, how they will wander down the streets with a coffee cup and immediately throw it away, eat throwaway, everything throwaway, they would’ve gone ‘what’s going on.’”
Other famous faces at the awards included Dermot O’Leary, Sir David Attenborough, footballer Mo Salah and Ed Sheeran who wore a burnt orange jacket during his ceremony performance.
The awards look to honour five winners each year whose innovations and sustainable solutions help the environment.
Each winner received £1 million in prize money, funded by the Royal Foundation, and they also receive a “global network of support” to help actualise these innovations.
The winners of the Earthshot Prize for 2021 included a restoration project from Costa Rica; air cleaning technology from India; a sustainable coral farming project in the Bahamas; a food waste hub in Milan and a renewable energy project across Thailand, Germany and Italy.