Bieber fans camp out in Mexico before free concert
Mexico Justin Bieber
A fan holds images of pop starJustin Bieber in Mexico City's main historic plaza, the Zocalo, Sunday, June 10, 2012. The Beliebers have arrived in the chaotic streets of Mexico City, adolescents in purple and white and braving two nights on roach-infested sidewalks for a chance to be closest to the stage when teenage superstar Justin Bieber puts on a free concert Monday evening on the capital's vast central plaza. (AP Photo/Marco Ugarte)