The former glamour girl-turned-businesswoman entered the Big Brother compound on Friday night as a shock late housemate to replace Ken Morley and Jeremy Jackson, who were booted out by producers.
But an insider has told the Daily Star that Big Brother bosses are already concerned Katie may walk because of pain she's suffering from her latest boob job.
Katie, 36, underwent a breast reduction procedure in Belgium ahead of entering the house and has told housemates she's still in pain.
Now, a source has said bosses worry she could leave for medical reasons: "We can't possibly lose any more of the housemates."
If she did leave, she'd be the FOURTH housemate this series to exit without being evicted by the public.
Ex-Baywatch star Jeremy Jackson was kicked out for unacceptable behaviour, while former Coronation Street actor Ken Morley was removed for offensive language and US soul singer Alexander O'Neal chose to leave.
Katie has spoken about her botched breast reduction in the house, revealing she has a hole in her breast from where the surgery went wrong. She was due to have it fixed this week but chose to enter Big Brother instead.
She revealed to her housemates: "They were going to take them out on Monday. That's how bad it's gone under there, it's a hole, my implant was hanging out on New Year's Day.
"But it hasn't stopped me coming in, because I'm not running around."
Mum-of-five Katie said before entering the house that she had a doctor on standby in case of a medical emergency.
"I'm still recovering from a boob reduction. Big Brother is aware of it. I had my boobs reduced," she said. "There is a doctor on standby the whole time to keep checking me but, other than that, my banter is still there! I've been glued to the show - it's a great series!"
CBB stars without make-up in pictures:
Copyright: Channel 5
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