Katie Price and Kieran Hayler's daughter Bunny "saved" their relationship after he cheated on her.

Katie Price and Kieran Hayler

Katie Price and Kieran Hayler

The 38-year-old star was pregnant with the youngster, who is now two, when she found out about the former stripper's 10-month affair with her then-best friend Jane Pountney, and his fling with her pal Chrissy, but insists the birth of their second child together was a "fresh start" for the pair.

In an extract from her new autobiography, 'Reborn', which is being serialised in The Sun newspaper, Katie wrote: "If there's one thing that kick-started the turnaround in the relationship between Kieran and me it was my little Bunny's arrival into the world.

"In lots of ways she became the fresh start we both needed.

"Normally, I wouldn't recommend having a baby to save a relationship - more often than not the strain breaks an unstable marriage. But I guess because we had kids already it wasn't such a shock to the system. If she'd been my first and Kieran had behaved as he did, I wouldn't have coped.

"It's funny how good things happen when you least expect them."

Katie - who also has son Jett, three, with the ex-builder - had warned Kieran she would blame him, Jane and Chrissy if Bunny had any medical issues, which, fortunately, didn't turn out to be the case, and she admitted he turned into a "family man" after the little one's birth.

She wrote: "Before the birth I'd been really hard on Kieran. I'd told him if the baby was premature, brain damaged or harmed in any way, I'd lay the blame at his, Jane's and Chrissy's door.

"Kieran did make those first few weeks of looking after Bunny much easier. He was being determinedly hands-on. He'd said that as a result of his ongoing treatment he'd refocused his life and was discovering who he truly was -- the family man I knew he had in him all along.

"After a while, my long succession of bad days gave way to some good ones.

"It was as if Bunny had breathed life into our relationship, and I will always see her as my little ray of sunshine."

Katie - who also has son Harvey, 14, from a fling with Dwight Yorke, and two kids, Junior, 11, and Princess, nine, with ex-husband Peter Andre - never thought she would be able to forgive Kieran after finding out about his infidelity in May 2014, but insists she knew he was a "good guy".

She added: "If someone had told me two years ago that I'd still be here, I'd still be married to Kieran and that I'd be loving life again, I'd have laughed in their face.

"It's not been easy. It's taken all our strength to overcome the past. But it's been totally worth it.

"It sounds mad, but I knew in my heart Kieran was a good guy. And each day, I spent a moment imagining what a happy future with him and the kids would be like."