'X Factor' hopeful Tamera Foster has been forced to apologise for attacking a 15-year-old while on drugs. After wowing the judges and viewers with her rendition of Whitney Houston's 'I Have Nothing Nothing' on Sunday, a violent incident from her past has now been revealed. Holly Wilks has claimed Tamera attacked her and a friend on Boxing Day in Gravesend, Kent, last year. Tamera Foster She told ...