The 'Starry-Eyed' singer - who won this year's Critics' Choice BRIT award â was rumoured to have worked with Diana Vickers before either girls had released a chart topping single.
Ellie told Q magazine: "Last year I worked with her before I signed my record deal because producer Guy Sigsworth is a friend of mine. He was like, 'yeah I'm working with that 'X Factor' girl Diana Vickers, do you wanna come down?' So I said, yeah why not?' I unexpectedly wrote some songs for her album. "
When the blonde star was asked what she thought of 'The X Factor' contestant she replied: "Well me excluded, she's had some really amazing writers. They're trying to make her massive I think. But then I don't know. I don't think I'm going to write for anyone again. I've decided it's not for me. Saying that, I might but it wouldn't be like that. I'd write with someone."
In the past Ellie has also written with pop star Gabriella Cilmi.