The 24-year-old singer, who wrote Britney Spears's hit Till The World Ends, said that she isn't writing songs for anyone else at the moment because she wants to focus on making her own act top notch.
She told Digital Spy, 'Right now I'm just being bizarre and writing about my experiences, so I don't really want to give them to somebody else because it wouldn't be true to them.
'If I write for someone else I want to make it personal to them and I don't really have the time at the moment to focus on somebody else.
'I'm obsessed about my tour and the UK shows at the moment. I'm a little OCD with what I'm doing now - I just want to be f**king perfect.'