Katie, 36, has spent the past week discussing her past relationships, including details of her marriage to Alex Reid and engagement with Leandro Penna, and it appears Peter hasn't been left out of the chat either.
However, according to the Daily Star, Katie has left lawyers in a flap with her admissions about the Australian pop star.
Fearing her conversations about Peter, who is father to her children Junior and Princess, could "jeopardise a forthcoming High Court battle with him", CBB bosses have apparently decided not to air the footage.
A CBB spokesperson declined to comment when contacted by the newspaper.
Earlier this week, Katie was shown in an episode talking graphically about her sex life with second husband Alex Reid, who she divorced from in 2011. Following her frank admissions, cage fighter Alex spoke out and said he was "disappointed" she had spilled details of their personal life.
Argentinian model Leandro has also posted several cryptic messages on Twitter after Katie made reference to the size of his manhood during a chat with housemates.
"To those who support me and to those who do not - everything and everyone learns in life," he said.
But although she has been willing to tell all, last night Katie told housemate Michelle Visage that she was worried what the public will think of her after speaking so frankly about sex.
Last night, Katie's brother Danny even hinted that he is embarrassed by her saucy talk.
CBB 2015: Housemates without make-up
Copyright: Channel 5