Has Christian Bale has gone to the dark side? The Dark Knight star has been arrested! According to reports in the British media, Christian's mother and sister say the actor assaulted them at a London hotel on Sunday evening. Christian attended the European premiere of The Dark Knight with his wife on Monday and then turned himself in this morning. However, London police won't confirm Christian's identity, saying only that, "A 34-year-old man attended a Central London police station this morning by appointment and was arrested in connection with an allegation of assault." Boo! He's supposed to be a crime-fighter, not an evil-doer…