Justin Bieber appealed to his fans on Wednesday (April 28) to calm down after his hat was stolen and his mother knocked over by a crowd of about 500 waiting to greet him as he arrived in New Zealand.

The frenzy came after Australian police on Monday (April 26) canceled a live performance in Sydney by the 16-year-old Canadian singer when a crowd of about 5,000 teenage girls got out of hand, with about eight youngsters injured in the crush and others fainting.

The hysteria surrounding Bieber, who is traveling to promote his debut album "My World 2.0," has sparked comparisons to the reaction of young fans when The Beatles went on tour in the 1960s.

"Finally got to New Zealand last night," Bieber told his 2 million-plus followers on Twitter. "The airport was crazy. Not happy that someone stole my hat and knocked down my mama. Come on people... I want to be able to sign and take pics and meet my fans but if you are all pushing security won't let me."

His album "My World 2.0" hit the No. 1 spot on the Billboard charts in the United States within a week of its release last month.

Questions? Comments? Let us know: @billboardbiz

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