News channels in Rio de Janeiro have filmed them camping outside the Sambadrome stadium where he's due to perform in five month's time.
They're sleeping rough on the pavement - taking it in turns to study, work and eat - to make sure they bag the best spot at the gig.
They will have to be patient though. Justin will take to the stage on 29 March 2017.
"We are here for our idol," one fan told the Brazilian TV network, Globo 1.
"We are here for our love for him and that's why we did all this madness."