A Japanese pop star has shaved her head and offered a filmed apology after breaking her management firm's rules by spending a night with her boyfriend. A sobbing Minami Minegishi apologised to her fans and said she did not want to leave the band AKB48, in the video seen by millions on YouTube, external. The production company behind AKB48 said Minegishi, 20, had failed to abide by its cardinal rul