Keira Knightley doesn’t like having her name taken in vain. The 24-year-old Pirates Of The Caribbean actress had generously donated her signed photo to a secondary school in Peterborough – but was horrified to hear that pupils at the Arthur Mellows Village College were trying to sell it on eBay. “Keira and 30 other celebrities including Alan Sugar and Colin Firth wrote good luck messages to the pupils, but Keira was convinced the whole thing was a scam,” says a source. “Eventually the school sent her a photograph of her signature among the others on a classroom wall – to assure her that it was not for sale.”