The Prince of Wales has enlisted the help of world famous supermodels to fly the flag for his Earthshot Prize.

       Heidi Klum and Winnie Harlow are among the high profile guests who will be walking the green carpet at the fourth annual award ceremony in Cape Town next month.

       The models will be among those to announce the next five winners of the prestigious ￡1 million prize – an award for contributions to environmentalism.

       The ceremony will be hosted by Billy Porter, an American actor, who is likely to add a flamboyant air to proceedings alongside Bonang Matheba, the South African broadcaster.

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       Other guests will include Robert Irwin, the son of the late Steve Irwin, who became an Earthshot global ambassador last year.

       Organisers are aiming to harness what they describe as an “explosion” of innovation on the continent which saw a huge increase in nominations for this year’s prize.

       The award ceremony will feature an array of African household names, many of whom are lesser known in the UK but have been brought on board to help whip up interest across the region.

       Harlow, 30, who was diagnosed with vitiligo at the age of four, has enjoyed huge success after appearing on America’s Next Top Model. In 2016, she was photobombed by Prince Harry during a charity polo match in Berkshire, later sharing the image on social media.

       She has her own vegan and “reef safe” skincare range called Cay Skin. Reef safe is a term used to describe sunscreens that do not contain chemicals known to damage coral and marine life. In 2022, Harlow attended the British Fashion Awards in a haute couture vegan dress made from cocoa bean husks.

       Klum, 51, has also championed sustainable fashion, warning that there was much work still to be done in the industry.

       The Earthshot ceremony will be broadcast in 50 markets across Africa in the midst of “Earthshot Week” in which Prince William will undertake a series of engagements in Cape Town focused on the urgent need for environmental solutions.

       It promises to be a night of “extraordinary storytelling” and musical performances to celebrate the work being undertaken across the planet in a bid to reverse the climate crisis, with a particular spotlight on Africa.

       Performers and guests will include Davido, Diamond Platnumz, Lebo M, the Ndlovu Youth Choir and Uncle Waffles.

       The Prince founded the Earthshot Prize in 2020. It will award ￡1 million to five winners every year for a decade.

       Each award ceremony has been held on a different continent, with London, Boston and Singapore playing host ahead of Cape Town.

       The Princess of Wales is not expected to join her husband in South Africa as she continues to prioritise her recovery following several months of chemotherapy treatment.