Justin Bieber isn't ''worried'' about when his album gets finished.

The 'Baby' hitmaker - who released his last studio album in 2012 - has insisted he is in no rush to get a new LP out and just wants it to be ''perfect''.

When asked when his new album would be out, he said: ''I actually don't know. I'm really not worried about when it's finished, I just want it to be perfect, so we're taking our time with it.

''I've been working with Kanye West and Rick Rubin. We've gone in with a bunch of different people. I'm just trying to get the best sound and have it be consistent and make sense with what I'm going through in my life right now.''

And Justin has revealed the new music will be ''very personal''.

He added: ''It's just very personal. People will be able to really get in to where my heart is. It's about my journey in life - stuff that I've been through.

''Maybe I can teach a lesson, certain things that are inspiring.''

And the 21-year-old singer is looking forward to have his guitar and drum tracks included in the new album.

Speaking to Martha Stewart in Interview magazine, he said: I play drums and guitar. My best instrument is definitely drums, so I'm featured a lot on the album drumming. It's pretty futuristic as well.

''Skrillex is on a really new wave and has found a way to take my vocals and mix them and play with them and pitch it up to make it higher with these cool effects that sound really futuristic. We have a really good chemistry.''