The former Spice Girl revealed on Heart radio that she is planning to move back to the UK later this year for "quite some time" with her family.
She quickly added: "I don't think I was meant to say that though. Oh sorry, pregnant brain, maybe that was a secret."
When probed by presenter Jamie Theakston whether that meant she is replacing Cheryl Cole on the ITV1 talent show, she replied: "Maybe so... anyway... I'm in so much trouble, why did I do this interview? I don't talk about anything unless it's ready to go."
Speaking about a possible return to her hometown of Leeds, she said: "The whole family is going to move, I think. I've yet to have the conversation with my husband but I have been thinking about it. I think if I'm going to move here, I'd move here for quite some time so the kids can get settled in school."
Simon Cowell and Cole are rumoured to not be returning to the UK X Factor because of their commitments in America.
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