Sugababes star Keisha Buchanan has accused former member Mutya Buena of "bitterness and jealousy". Buchanan is fed up of hearing the 'untrue' stories that have come from Buena since her departure. She tells British magazine Closer, "Mutya's behaviour is unacceptable and I'm not putting up with it any more. She needs to stop disrespecting us and making things up. I think she resents us for moving on and doing well."