Amy Winehouse is set to donate £50,000 (U.S. $100. thousand) to a Romanian orphanage after discovering her hair extensions could have come from there.The 'Rehab' singer - who wears a weave to boost her trademark beehive hairstyle - was shocked to discover orphans often have all their hair cut off to provide extensions for western women. Although Amy has ensured the pieces she uses come from ethical sources, she is determined to help. A source said: "Amy met a lovely lady from the group Beauty Hurts and they started chatting about the real hair racket."She had no idea orphans were exploited. She knows where her weave comes from and to be honest, it's the US where most of the unethically culled hair ends up but she still wanted to help."Amy was keen to keep her generous donation secret but realises it's important to highlight the issue. Meanwhile, it was recently revealed Amy has signed up to headline the 2007 MTV Woodie Awards.The 24-year-old star - who has not performed in the US since she pulled out of several high profile events and her American tour this summer due to "health issues" - has agreed to top the bill at New York's Roseland Ballroom on November 8.