Pregnant model Katie, 36, was stunned to learn in May that her husband Kieran had been having a seven-month sexual relationship with her close friend Jane Pountney.
Jane was also married, to husband Derrick.
Now, Derrick, 51, has confirmed to The Sunday Mirror that he and Jane are separating, saying: "We've been discussing our future and we are getting a divorce.
"It's true that she was falling for Kieran. She said that."
Derrick said that he and Jane, 49, are currently sleeping in separate rooms at their home as they've yet to work out how to divide their possessions.
"It's early days and there's not been time to divide houses up," he said. "It's just not that easy so we're still living together for the time being."
The affair between Jane and Kieran, 27, was publicly exposed on 7 May when Katie sent a flurry of tweets branding Kieran "disgusting" and calling close friend Jane a "homewrecker". She stated in her tweets she would divorce Kieran.
She uncovered the affair just a few days after publicly announcing she was six months pregnant with Kieran's second child. Their first child, son Jett, was born the previous August. Katie accused Kieran of beginning her affair just after Jett was born and continuing it while she was expecting again.
Jane had been one of the few guests at Katie and Kieran's beach wedding in the Bahamas in January 2013.
Since the affair was discovered, Jane has not spoken out publicly, except to confirm it did happen and say she "deeply regrets" it.
Kieran, meanwhile, has given a few interviews openly admitting his love for Katie and his desire to win her back. In one interview, he revealed he'd written a letter to Jane dismissing their affair as "sleazy sex" and claiming he's an addict who was just in it for the thrill.
Jane's husband Derrick, however, told The Sunday Mirror that Jane had told him she was falling in love with Kieran.
Derrick says he hopes to remain friends with Katie now, as he's known her since was 15 years old. He said he'd been in contact with her since the affair news broke.
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