Celebrities join Prince William for Earthshot Prize award

LONDON  - Celebrities joined Prince William in London on Sunday for the inaugural awards ceremony of his Earthshot Prize, an ambitious environmental program aimed at finding new ideas and technologies around the world to tackle climate change and Earth's most pressing challenges.

Actors Emma Thompson, Emma Watson and David Oyelowo were joining Kate, the Duchess of Cambridge, in handing out the awards at Alexandra Palace in north London.

Guests were asked to "consider the environment when choosing their outfit," so Watson arrived wearing a gown made of 10 dresses from the charity Oxfam. Kate wore an Alexander McQueen dress made for her in 2011, while her husband wore a dark green velvet blazer and a polo neck.