The campaigner has long been a supporter of the charity and will be stepping up her role in campaigning and fundraising for Oxfam.

The Italian-born charity campaigner is known for her support for sustainable fashion, fair trade in the fashion industry; and her work as a film producer with a special interest in social campaigning...

Her feature documentary, In Prison My Whole Life, was shown at the Sundance Festival 2007.

The socialite has supported Oxfam for many years and has visited its programmes in Bangladesh and Zambia...

She has also helped Oxfam fundraise in the UK, USA and Italy and actively networks to encourage other women to support Oxfam's campaigns, especially fair trade in the fashion industry...

The charity's new recruit says she hugely respects the way the charity works: "supporting communities to find solutions to the problems they face; whether by safeguarding the rights of women, ensuring that people have access to healthcare and education or something as fundamental as making sure that everyone has enough to eat..."

The new Oxfam ambassador says she also likes to shop in Oxfam’s second hand shops and celebrates Oxfam's reuse rather than throwaway fashion policy...

Oxfam spokeswoman Claire Lewis, says: "She has a huge amount of energy and is passionate and committed in her support of Oxfam’s work... We are looking forward to working with her even more closely now as a global ambassador."

Oxfam says the filmmaker's fundraising auctions have previously proven a hit with the charity. The film producer donated the jewellery she wore to the 2011 Baftas and to the 2011 Oscar ceremony and more recently donated four other dresses she wore on the red carpet to the charity...