Justin Bieber has opened up on how he has matured into a man.

The singer, who recently turned 18, has effused a somewhat more mature feel in the past year, with the video for his hit track 'Boyfriend' for example ditching the boyish charm he was previously known for.

Bieber is due to appear on the cover of the August Rolling Stone magazine and he said in the accompanying interview that he feels the way he "carries himself" has changed as he has grown up. He said:

"I feel like I carry myself in a more manly way. I don't carry myself as a boy."

Bieber's manager Scooter Braun meanwhile spoke to the magazine about his fans' take on his relationship with Selena Gomez. He said:

"Yes, there's gonna be some girls that if they see him with a girlfriend, it kills the dream, but there's also gonna be girls that see him with a girlfriend, hear about the romantic things he does and want him even more."

Watch Justin Bieber's Rolling Stone photoshoot below: