Bieber Fever has hit Mexico City as Justin Bieber took to the stage to perform in front of 200,000 screaming girls.

The free gig was to promote the release of his highly anticipated third album, Believe.

Justin's fans, the Beliebers were out in full force, with some camping out for days to get the best spot to see their idol.

"Justin I love you," screamed one.

"Thank you because it was free, the concert was great. Thank you for singing songs from your past album and your new album, it was very cool. Come back soon."