September 6, 2012 Photos | Justin Bieber's Birthday: Celebrating 18! Edit Delete Tags Autopost Justin Bieber's Birthday: Celebrating 18! Related Artists Justin Bieber Source: http://www.mtv.com/photos/justin-biebers-birthday-celebrating-18/1680060/6943843/photo.jhtmlAlecia Elliott Alessandra Ambrosio Alexis Bledel Ali Campoverdi Ali Larter