The 35-year-old model-turned-businesswoman claims her 26-year-old husband a former stripper - is fast becoming a middle-aged man thanks to his chicken-keeping and motoring hobbies, and joked she might have to trade him in for a younger model.
Speaking to Now magazine, Katie admitted: ''He's very romantic. When we got together he was stripping four times a week and going out.
''Now he likes to stay at home and he's got chickens. He's even bought himself a 4 by 4 ... He's getting too old for me! The other day he said, 'Oh my God, next year you're going to say I'm too old for you and trade me in for a younger model', and I said, 'Yeah you're right'. ''
The busty brunette - who has children Harvey, 11, Junior, eight, and Princess, six, from previous relationships and five-month-old Jett with Kieran - has no plans to stop expanding her brood and would consider adoption in future.
Katie said: ''When the doctor says I can't have any more, I'll stop. And then find a surrogate mum and adopt. I don't think you should plan, so whenever.''
While Kieran has given up his part-time stripping job, the reality star doesn't want him to quit altogether because she enjoys his special skills.
Katie laughed: ''He keeps changing his mind, but I'd love him to carry on. He's a plasterer by trade. It's brilliant. And he's got every uniform upstairs, too - policeman, fireman...''