Cameron Diaz, Colin Firth & More Step Out in Eco-Friendly Fashion for Oxfam (PHOTOS)

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What’s better than dressing up for awards season? Dressing up in something that helps save the world!

On Wednesday, Oscar winnerColin Firth and his wife Livia hosted an intimiate dinner at the Chateau Marmont to benefit Oxfam America, an international relief organization that combats poverty, hunger, and injustice. The red carpet couple decided to bring some awareness into the mix and asked their famous friends to dress in eco-friendly fashion — and boy, did party guests step out in style!

Cameron Diaz,Emily BluntKimora Lee Simmons, and more donned on their best environmentally-friendly duds for the occasion.

This is Livia Firth’s third year is spearheading the project which asks top designers to use eco-friendly fabrics when designing gowns for awards season. Saving the world with one dress at a time? We’re totally loving this concept!

Check out the best “green” fashion in the gallery above!