A radio producer wearing a beanie, dark glasses and a scarf, was mobbed when he left an Auckland hotel after interviewing the stars with young girls believing he was a member of the five-piece band.

Guy Parsons, 23, is older and taller than members of One Direction but still fooled the hysterical young girls who chased him down the street.

Some realised he wasn't who they thought he was when he turned around, but others didn't care.

"I said 'I've got you, I'm not one of them', but they still wanted photos," Parsons told the Sunday Star-Times, adding he enjoyed his brief moment of fame.

"I don't think I could do that everyday, but for the three minutes I was posing and running away from the girls I liked the attention."

The band, who performed two shows in Auckland on Saturday and another in Wellington on Sunday, have become one of the most famous pop acts in the world and are hounded by crying and screaming girls wherever they go.

Fans began arriving 14 hours before the early evening concert in Auckland and 15-year-old Raina Hepers told the Herald on Sunday that when the stars finally took the stage she sobbed through most of their 70-minute performance.

"I just can't believe I saw them in real life. I only stopped crying for five minutes, I'm just so happy," Hepers said.

Lucy Crabb and Madi Dearlove, both 12, said they had sore throats from screaming at the boys who looked "way better in real life than in photos".

One Direction were formed for the British television series 'The X Factor'.