The 36-year-old star is still fuming after her estranged husband confessed to having a secret liaison with her former best friend Jane Pountney last month, just days after she discovered she was pregnant with their second child together.
The straight-talking businesswoman was unimpressed with the builder's recent tell-all interview and hinted there was more to the story than meets the eye.
She wrote: ''I'm not sure I'll ever get the complete truth from Kieran about his affair with my ex-best friend Jane - or any other women - but I know enough and I've read enough.
''I knew Kieran was planning to talk to the press. He said he wanted those who were criticising me to know he was at fault and to apologise. I didn't know what he was going to say and I was too concerned about my unborn child to care, frankly.
''Let's just say that even in 'coming clean' to the press Kieran still wasn't telling the full truth - not even close!''
Katie - who has children Harvey, 12, Junior, eight, and Princess, six, from previous relationships, and nine-month-old Jett with Kieran - has also teased the idea that Kieran might have cheated on her with several women as well as his seven-month affair with Jane.
She wrote in her column for Now magazine: ''I let my anger out on Twitter once again - and I apologise for my choice language - but this wasn't a response to Kieran's articles as some presumed, rather at him confessing other things to me. I shouldn't have done that publicly, but I lashed out fuelled by despair, anger and hormones!
''As a result of everything, I've made certain decisions and will act on them. My focus is on a healthy pregnancy and my children.''
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