Travelling some 13 hours from the northern state of Tamaulipas for the concert, 13-year-old fan Julisa Reyna said the Canadian singer was an inspiration for her.

"For me he is an inspiration, he inspires me when I think that I can't do something I think of 'never say never' (Bieber song) because he taught us this, to never give up and keep following your dreams. He makes me happy, without him I don't know where I'd be," she said.

One of Beiber's biggest hits is "Never Say Never". Penned by the teen star, fans say it has motivated them to realise their dreams.

"He inspires you to follow you dreams and never give up because sometimes you think you are not going to achieve anything and then something happens, 'never say never'," said fan Adriana Velasco.

Justin Beiber has become a modern-day pop cultural icon. With over 40 million fans on Facebook and about 19 million of Twitter, he has inspired a range of dolls and toys and even a successful nail polish line called "One Less Lonely Girl".

The Canadian star has won young hearts the world over with his clean good looks and boy-next-door charm.

"I love him with all my heart and I love him a lot. I don't know, to give me a hug. I love him a lot," said fan Jasmin when asked what she would say to the teen sensation.

Authorities in Mexico have called in police to help with crowd control for the massive event. Constructing barriers and entry and exit points to facilitate movement, authorities are looking to avoid similar scenes of violence that injured dozens of Bieber fans at a recent appearance in Oslo.

The "Baby" singer is expected to take the stage in front of 200,000 people and sing his biggest hits and premiere songs from upcoming album "Believe".