Kieran had been staying in a spare room of the model's mansion since she discovered the 27-year-old stripper had been cheating on her with her close friend of almost 20 years, Jane Pountney, just days after Katie confirmed she was six months pregnant with his child.
But yesterday, Kieran's mum arrived to pick him up and drive him back to the family home with an overnight bag.
Up until now, Katie had allowed him to stay in the spare room of her West Sussex mansion so he could continue to see their nine-month-old son Jett Riviera.
A family friend told The Sun: “Kieran has been well and truly shown who is boss in this marriage.
“He suffered not only the humiliation of being booted out of the marital home with his tail between his legs, but also the demeaning process of his mother having to pick him up.
"He has nothing without Katie. Kieran is a mess and will do anything to save the marriage. But Katie won’t be made to look the fool."
“His brain was in his pants and it has cost him dearly.”
Earlier this week, Kieran blamed his cheating on a “compulsive addiction”, for which he is now reportedly seeking help for in a £2,500-a-day clinic.
“I lie compulsively to get an adrenaline buzz. I never knew about anything like this but throughout my life I’ve never been faithful because I’ve never had a relationship.”