Justin Bieber has revealed that he works out every day in an attempt to build his muscles.

The superstar singer has changed his image somewhat over the last year or two, sporting a more mature look - and it seems a buff body is an important part of it.

The 'Boyfriend' man has also found himself stripping off his shirt to go topless, much to his fan's enjoyment.

Speaking to Us Weekly, Bieber said that he is working out to create some more muscle on his body. He said:

"I train every morning. We do body-weight stuff. Just trying to…get some guns!"

As previously reported, Bieber recently thanked Lady Gaga after she praised the singer on Twitter.

The Canadian recently hit 33 million followers on the social networking website and enjoyed the sixth anniversary of his YouTube channel.

Watch Justin Bieber get topless recently below: