The Former glamour girl, 41, shared a snap of herself cuddled up to boyfriend Kris Boyson, 31, with a mysterious caption.
She wrote: “If only people knew what we know.”
The message sent her followers into a frenzy and they flocked to her page to ask whether she’s expecting.
One wrote: “You’re pregnant, again,” and another added: “Pregnant again.”
A third commented: “A new baby price is on the way!”
Mirror Online can confirm mum-of-five Katie is not pregnant and it’s likely to be a reference something very different.
Some fans shrugged off the baby rumours and speculated the couple could be engaged or had married in secret.
If Katie was pregnant it would be her sixth child, while a possible engagement would mark her fourth marriage.
She also is mum to Junior, 14, and Princess, 11, from her marriage to Peter Andre, Jett, five, and Bunny, four, with Kieran Hayler, and Harvey, 17, from a fling with Dwight Yorke.
Peter was her first husband and they divorced in 2009.
She married husband number two, Alex Reid, just months after finalising her divorce from Peter but that marriage didn’t last either.
They split in 2011 and she went on to marry for a third time in 2013 when she tied the knot with stripper Kieran Hayler.
That marriage ended last year amid claims Kieran had cheated on her.
She went on to strike up a romance with personal trainer Kris, who she’s been with on and off since last summer.