Justin Bieber has sparked concern among fans after a string of controversial behaviours over the years - as the star proves he has an alarming rebellious side to him

Justin Bieber has opened up about experiencing self-doubt and imposter syndrome, admitting he often feels unworthy of his success.

Canadian pop star Justin Bieber opened up about struggling with imposter syndrome, drawing attention to celebrities having to balance the popularity and constant spotlight that comes with oodles of scrutiny.

Justin Bieber made headlines last year as he became a first-time dad. Now, the last few months, the pop star has been causing concern and fear among his fans because of his appearance and cryptic posts on social media.