The 36-year-old former glamour model appeared to suggest that she may never had one of the tests, which detects abnormal cells inside the cervix.
From the age of 25, women are supposed to have a smear test once every two years, however, Katie admitted that she had been assuming it was done when she had children.
"I’m not being crude, I just presumed they check for everything.”
"I haven’t had a smear for... I don’t remember the last time,” she admitted. "I’m going to have to get one."
Katie began fronting the weekly radio show last month and the star has used her airtime so far to talk about everything from her relationship troubles to her struggle to deal with sexual abuse she has faced.
Earlier this year, Katie discovered that her husband Kieran Hayler, with whom she has one child and another on the way, was having an affair with her then pal Jane Poutney.