Britney Spears has started work on her next album - and fancies including a duet with Katy Perry.

The 32-year-old singer revealed that she has been in the studio to record the follow-up to 2013's Britney Jean, adding that she wants to do something completely different.

"It's in the works," she told Extra TV. "I want to do something very artsy fartsy - something that I've never done before.

"Even if it's just take a left lane and go for a little bit of rock or rock-pop. Just do something that's kind of out there and different."

Asked about dream collaborators, she added: "I love Katy Perry - I'd love to do something with her. Or Iggy [Azalea] - that would be cool."

Yesterday (September 9) Spears launched her first sleepwear and lingerie line at New York Fashion Week, before returning to Las Vegas to continue her Piece Of Me residency at Planet Hollywood.