When asked about her famous ex-husband Peter Andre, she said: "If I'm honest, I want to disown the man."
"We don't talk – he's not the man that I fell in love with.
"I thought he thought with his heart but now it's about money and fame - if you read the book it explains the reasons why.
"I'm not just being harsh when I say that."
Katie, 35, is Down Under promoting her new book, Love, Lies and Lipstick - her fifth autobiography - and was chatting on a breakfast TV show called Sunrise when the outburst happened.
Peter and Katie split in May 2009, ending their marriage after four years together. They have two children together, Junior, 8, and 6-year-old Princess Tiaamii.
Katie, who headed straight to the TV studio after landing in Australia, added: "I don't see him, or speak to him."
Meanwhile, she's already missing her new husband Kieran Hayler and their baby son Jett. Katie said Jett was unable to travel as he doesn't have a passport.
Katie tweeted: "Finally on the flight for OZ going to miss my family sooooo much @kieran0322 love you so much give big kiss to all kids x #workingmum"
Pete has not responded to Katie's interview.
Watch the interview here...
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