The speculation began after Katie announced recently she'd be spending three or four months Down Under over the summer, working on a top secret new project.
But that project is NOT another CBB stint.
She tweeted today: "I want to 100000000% clarify I am not doing Australian Big Brother and I've had NO discussions or even communication about it #rumoursagain."
Katie, 36, won the last series of Celebrity Big Brother earlier this year.
She announced her Australian plans in March, teasing: "I'm really looking forward to coming to Australia. I have something big coming up in Australia so I will be there for about three months, I think. I'm moving over for three months in June. I have a big job happening. I can't wait to come over! For three or four months!"
One project we know Katie IS working on is a new reality show. When a follower tweeted this weekend to ask her to start a new fly-on-the-wall series, Katie delivered a surprise answer claiming one is already in the pipeline!
Katie is also writing a new autobiography, to be released in October.
Her book will reveal the inside scoop on what happened with husband Kieran's affair and aftermath, and reveal previously unknown details about her experience with a "household name"
" I think I better leave the country when that one comes out. There are lots of things in this one I left out in the last one. There are a couple of guys in there who have upset me so I think it's about time I tell the truth about them. They are a household name. I'll be disappearing somewhere in the Maldives or somewhere where no one can see me when that book is out."
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