Justin Bieber fans in Chile swarm hotel

Justin Bieber fans went nuts for him at his hotel in Chile -- a full day before he even arrived.

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Justin Bieber fans went nuts for him at his hotel in Chile -- a full day before he even arrived.

Justin Bieber fans in Chile went loco outside his hotel on Friday.

Just one problem: he wasn't there yet.

A mob of hundreds of shrieking young girls swarmed the W in Santiago thinking that their favorite pop star was there, but Bieber was actually still in Buenos Aires.

"CHILE is tomorrow but I think they are ready. wow," he tweeted, along with a video of the mayhem.

Chilean authorities were so concerned about the crowd, they actually contacted Bieber's camp and requested he arrive at the hotel via helicopter to keep the fans from swarming him.