Katy Perry plans to move away from pop music and go back to her acoustic roots.

The 28-year-old singer wants to model herself more on Joni Mitchell and having a more mature sound going into her 30s.

Perry told Billboard: “I'll probably turn into more of a Joni Mitchell as I inch towards my 30s.

"I think my fourth record will be more of an acoustic guitar album. That's where I started when I was first discovered by (songwriter/producer) Glen Ballard and got my first record deal.

“We'll see - I can't get ahead of myself. I'm still doing the work: I'm a good balance of left and right brain, and to be an artist with a long career, you've got to have both... I've got a few records under my belt, and I still feel like a brand-new artist. People still want that truth to cut through."

Perry will release her third studio album Prism next month.