The 23-year-old star recently released her second album 21 but has revealed her plans for a follow-up already.
Speaking to Q magazine, she said: 'I've accumulated some things to write about again. I'd go into the studio tomorrow if I could.
'It won't be a big production. I want it to be quite acoustic and piano-led. I want to write it, record it, produce it all and master it on my own.'
She added: 'I think it'll take a lot longer because I want to do it this way. When I move house in the summer, my sound engineer is going to come and help me install a studio and teach me how to use it.'