Justin Bieber was forced to cancel a gig in Australia after fans were hurt in the build-up to the show.
Loads of fans camped out overnight in Sydney for a chance to see the 16-year-old singer, but as people pushed forward several fans fainted.
Police were called and due to "mass scenes of hysteria" it was soon decided that the gig had to be cancelled.
Justin later posted on his Twitter page that he was just as disappointed about what had happened as his fans were.
The Canadian superstar, who's in Australia to promote his My World 2.0 album, said the first he knew of it was when he woke up to hear the show had been cancelled for safety reasons.
He tweeted: "I'm very happy about the welcome and the love from around the world, but I want everyone to still remember my fans' safety comes first...
"At the end of the day I want you all to enjoy the music."