The busty businesswoman is so relaxed around her new husband -who she wed in January with a surprise ceremony in the Bahamas - she even feels comfortable passing wind in the same room as him.
In an extract from her new autobiography, 'Love, Lipstick And Lies', published in The Sun newspaper, Katie said: ''I really feel complete with him, protected and looked after. That feeling of insecurity I've always had with other men, I don't have with Kieran. I feel more content now than I've ever been.
''And a confession: I'm so relaxed with him that I even fart when he's in the room. I've never done that in front of a man before! OK, so it's not going to make it inside a Valentine's Day card but it shows how relaxed I am with him.''
Mum-of-four Katie - who has Junior, eight, and six-year-old Princess Tiaamii with her ex-husband Peter Andre; Harvey, 11, from her relationship with Dwight Yorke and two-month-old Jett Riviera, her first child with Kieran - is smitten with her 26-year-old toyboy and insists she has ''saved the best for last'' and finally met the right man.
The 36-year-old star said: ''I soon discovered he is also the most romantic guy I've ever been out with. He takes me out to dinner and pays. He is always thinking of me. Most important of all, when he met the kids he was brilliant with all of them.
''I always feel like he's backing me up with the children. It's not that he's trying to be a father figure, just supporting me. Now we have our new son, Jett Riviera, it looks like Kieran will be a fantastic dad. He's great with my kids and such a genuine, lovely man. I love him so much. I really have saved the best for last!''