Speaking on her FUBAR Radio show, Katie said CBB bosses offered Kieran the whopping fee in an attempt to get him to sign up to the next series.
And, interestingly, Katie added that the fee on the table was more than the amount her ex-husband Alex Reid was paid to go on the show back in 2010.
Katie, who is pregnant with her fifth child, told listeners: "I've had past relationships where the guy has become a celebrity on the back of me.
"I knew with Kieran he wasn't interested in all that. He was offered more money on CBB than Alex Reid.
"I got Alex £150,000, but they offered Kieran £200,000. He said no to that, he's not into it. He's a plasterer. Also, there is a baby on the way!"
Along with her FUBAR co-host Mark Dolan, Katie discussed her feelings towards people who sleep with a celebrity to become famous.
She said: "I cannot sleep with someone unless I'm attracted to them. Some of these blokes are so ugly. Being a celebrity isn't a big deal - I don't know what people think my life is like.
"Kieran's bosses [when I married him] were like, 'Why have you bothered coming back to work? We thought you'd be at home drinking champagne?' Just because we're in the public eye, we're normal!"
Despite previously telling fans she would be divorcing Kieran after discovering he'd been sleeping with her now ex-best friend Jane Pountney, Katie admitted today that he is "around" and helping with their son Jett.
She admitted: "We had a sh*t time last year when he was more interested in a 50-year-old f***y than his son.
"He is about [now], obviously, alternating nights with Jett. Everyone deserves a chance."
Katie and Kieran married in the Bahamas in January 2013.
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