The model-turned-businesswoman, 36, is currently pregnant with her fifth child, a baby girl, but has said she's keen to expand her family even further.
On her Fubar Radio show, Katie said: "I'll wait until my forties and have another two... I just want a big family but the problem is, what car do you buy?! I'd have to buy a mini bus!
"I have always wanted a big family and I'll keep going until the doctor says, 'You can't have anymore. Kate, enough is enough!'"
Katie is already mum to sons Harvey, twelve, Junior, nine, Princess, seven, and Jett, nearly one.
"I'm lucky because I have a girl and another girl on the way, and then the boys," said Katie. "I have everything."
Katie announced her fifth pregnancy in May. It will be her second child with estranged husband Kieran Hayler, who is also dad to her son Jett.
While announcing a pregnancy should have been a happy time for Katie, she was left devastated when shortly afterwards she learned that Kieran had been cheating on her with her best friend.
According to Katie, the affair took place over seven months, beginning shortly after she gave birth to Jett.
Katie initially vowed to divorce Kieran but has hinted lately that she is willing to sort things out, suggesting she'd even take his surname officially if he proves himself to her.
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Stars who welcomed babies in 2014 in pictures:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe