Joe Jonas believes his solo album is more "mature" than the music he makes with his brothers.

The Jonas Brothers star - who will release his debut solo LP 'Fast Life' on September 5 - says penning the material for the record alone has made it more personal as it explores him growing up.

He said: "It's a more mature sound and I wrote nearly every song on the album, so I'm singing about things I've gone through in the last year and really speaking from my heart. It's definitely a coming-of-age record."

Joe admitted he initially struggled to write songs without his brothers, but is happy with the way he eventually found his voice.

He added: "In the beginning, it was difficult because I hadn't written many songs without my brothers.

"I was putting a lot of pressure on myself to write honest lyrics and not hold anything back. I've just gone for it though, and I'm happy with the outcome."