Gab Mangine has 15 Justin Bieber concerts.

Justin Drew Bieber (born March 1, 1994 in London, Ontario, Canada) is a Grammy Award winning Canadian pop singer, songwriter, and multi-instrumentalist. Bieber was discovered in 2008 by American talent manager Scooter Braun, who came across Bieber's videos on YouTube and later became his manager. Braun arranged for him to meet with entertainer Usher Raymond in Atlanta, Georgia. Bieber was signed to Raymond Braun Media Group (RBMG), and then to an Island Records recording contract offered by record executive L.A. Reid.