''Horrified'' Minnie Driver has quit as Oxfam's global ambassador after sex scandal allegations against the charity surfaced.

The 48-year-old actress has worked with the charity for over 20 years but has decided to step down after a recent investigation revealed an alleged cover up of aid workers' use of prostitutes in Haiti.

Minnie told the Daily Telegraph: ''I am nothing short of horrified by the allegations against Oxfam International.

''In no uncertain terms do I plan to continue my support of this organisation or its leaders. And though it is unfortunate that after 20 years I am no longer able to advocate and defend through this specific framework, social and economic injustice is more globally prevalent than ever. I certainly will not let the abhorrent mistakes of a troubling organisation stop me or anyone else from working with good people in this space to support a population of human beings around the world that needs our help.''

A spokesperson for Oxfam said the company was ''saddened'' by her decision to step down but that they respected her wishes.

Oxfam told MailOnline: ''Minnie Driver has been a devoted Oxfam supporter for many years, and we are grateful for her commitment to ending global poverty.

''Her decision to step down as an Oxfam Ambassador saddens us deeply, but we also understand and respect her choice.

''As an organisation, we are ashamed by the actions of some of our former members of staff and are more committed now than ever to learn from our mistakes and ensure we uphold the highest levels of safeguarding standards in our work around the world.''

Other Oxfam global ambassadors include Helen Mirren, Coldplay and Bill Nighy.