The former glamour model - who gave birth to her fifth child this week - recently reconciled with the stripper after he admitted to being unfaithful with Chrissy Thomas and best friend Jane Poutney but she insisted he was truly honest with her before agreeing to take him back and even used the specialist truth-detecting equipment used on ITV's 'The Jeremy Kyle Show'.
The 36-year-old star told OK! magazine: ''I used the people Jeremy Kyle use. I know that sounds clichéd but I just figured out that ITV must have checked them out and that they knew what they were doing.
''Kieran said it was the worst thing ever. He tried to take energy drinks, slow down his breathing - everything he could to try to trick the test, but he couldn't.''
Katie - who has children Harvey, 12, Junior, nine, and Princess, seven, from previous relationships and 11-month-old Jett and her as-yet unnamed daughter with Kieran - revealed her husband has undergone a number of lie detector tests and she's planned the questions prior to each session.
Katie explained: ''You have to [plan the questions] because you have to pay for it and you have to ask the right questions.
''For example, I asked, 'Did you fall in love with Jane?' He said no, and that was the truth. I asked, 'Were you going to leave me to be with Jane?' He said no, and that was the truth. If he hadn't passed those questions, he would have been gone.''