Photo courtesy of AAP One.
Hundreds of teenage girls gathered at Sydney International Airport to welcome the pop group ahead of their sold-out tour of Australia.
Dressed up and sporting banners, many were left broken-hearted as the quintet - Niall Horan, Zayn Malik, Liam Payne, Harry Styles and Louis Tomlinson - were whisked away through a back door and into an awaiting car.
Fans had camped overnight with the majority arriving before sunrise to catch a glimpse of One Direction before a series of media appearances this week.
The group have become an overnight pop sensation with sales of more than 4.2 million albums in six months since they formed on Britain's version of The X Factor.
One group of fans at the airport hoped the group had watched their homemade videos on YouTube, titled 'Reasons Why One Direction Should Come To Australia'.
"We're so happy that they're finally here and it feels amazing that everything is coming into place," said 15-year-old Lola Emmanuel.
"But it's really sad they couldn't come out and meet their fans and there have been a lot of tears."
Otherwise it was carnival scenes at Sydney Airport with fans cheering and singing One Direction songs, including Up All Night and What Makes You Beautiful.
"They are the most amazing group of five boys that you'll ever meet," said one fan, holding back tears.
"They have amazing voices and great personalities and beautiful faces."
One Direction's sold-out tour starts in Sydney on Friday.