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Cameron Diaz took part in Livia Firth's Green Carpet Challenge at the Met Costume Institute Gala in New York last night.
Green Carpet Challenge founder Livia Firth said: 'Yet again the GCC has been given a window on the supply chain and incredible technical processes involved in producing fashion at this level, and Stella McCartney has allowed us to influence this process.
'Our next goal is to tackle the sourcing of embellishment materials. Who knows, this time next year every attendee at the Met Ball might be in a complete GCC gown - that's my dream!'
As founder of the initiative, of course Livia Firth wore a dress that met her green credentials too, dazzling in a sumptuous Prada piece. Made to conform to the GCC's criteria, the black panelled gown mixed certified silks, tulle and chiffon with sustainably harvested ostrich feathers and end-of-line British-made lace.
Her jewellery was by Monique Pean, her clutch by Donna Karan from her project Naturally Haiti.
Wearing Prada, Livia Firth tied in with last night’s launch of the major fashion exhibition of 2012 at the MET, Schiaparelli and Prada: Impossible Conversations.