Justin Bieber has been on quite a ride in his six or so years since entering the limelight. Although his debut single Baby still holds the title for most disliked video on the internet, we've recently seen a new, more mature Biebs in both his sound and his clothes, converting even the most resolute Bieb-thiests in to Beliebers. The 21-year-old has evolved his style greatly over the years and to mark the release of his new album, Purpose, we've decided to investigate that change...