It is reported that teen star Justin Bieber has insisted that he will only appear on 'Glee' if 'X Factor' judge Cheryl Cole joins him.
The Sun claims that Bieber has said that the show would be an ideal way to introduce Cole to American viewers.
Bieber, who has spoken of his admiration for Cole in the past, also reportedly wants singer Miley Cyrus to appear in the hit musical series.
