Since her husband's cheating scandal erupted last week, a devastated Katie, 35, has kept a low profile at her home in Horsham, West Sussex.
Who can blame the former glamour model for wanting to keep her head down after she announced that her husband of 16 months Kieran, 27, had cheated on her with her married best friend, 49-year-old Jane?
Now, six months pregnant with her second child with Kieran, Katie is leaning heavily on her family - her Mum, Amy, brother, Danny and sister, Sophie - as she deals with the true devastation of the sorry saga.
In fact it was Sophie who initially raised the alarm after voicing her concerns about Kieran's close friendship with Jane.
"It was Sophie who sparked it off after picking up on a few things Jane had said and her suspicious behaviour," a friend tells us.
Katie made the shock announcement on Twitter last Wednesday (7 May) announcing the end of the marriage and the dreadful reason for it: "Sorry to say me and Kieran are divorcing, him and my best friend Jane Pountney been having a full blown sexual affair for 7 months."
She went on to brand her former pal Jane, 49, a "whore, homewrecker, slut" and Kieran "a disgusting human being" on the social networking site.
Unsurprisingly the bombshell has left fragile Katie, who admitted to feeling the "worst pain in the world", veering from one emotional extreme to the other.
"She had a screaming session then flicked into crisis control. For now she has removed her head from her body and separated herself from her emotions to try and cope with what's happened," says the friend.
"The one constant is that she's absolutely devastated."
Flicking into autopilot hasn't fooled those closest to her, however, and Katie's family are on high alert.
"Naturally her mum, Amy, is absolutely furious with Jane. Together with Katie's brother and sister, they are rallying around her," Katie's friend tells us.
"Katie is vulnerable emotionally, so this is where her family have stepped in and want to keep Kieran out of the equation.
"Her sister Sophie is staying with Katie at the house. Kieran is still at the house too, but he's been moved into a cabin in the garden.
"Her family have separated Katie from Kieran because they're worried about her. She's not in a great place with the pregnancy and they just want everything to be OK with the baby."
Keeping a low profile through all the dramas and yet to comment on the claims, Kieran has been focusing his efforts on winning Katie back.
The friend tells us: "Kieran is begging for her back. He wants to save the marriage, saying he's an idiot, even trying to say it was Jane who hit on him. He's doing everything he can."
For our full six-page report on Katie's agony, check out Reveal magazine – out now
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