However, Nikki has denied the claims in an interview with MailOnline, and the 40-year-old nanny blasted Katie as ‘vile’, vowing to ‘go through to the end with her on this’.
She said: “I’m going to clear my name. I’m not going to be just somebody else that she’s disposed of and thought, do you know what, I’m going to use her. It’s not going to happen. She’s vile.”
Addressing the claims she had an affair, she said: ‘It’s incorrect, it’s slandering my name. Surely you have to have some sort of evidence to basically ruin me?
“It’s all just a complete lie. There were no intimate emails. I have the emails. If she’d have sent the emails to the press, they’d have seen there’s no intimacy in them emails. It’s all a little story that comes from her head.”
However, Katie insists she’s been left heartbroken after her 30-year-old husband actions and speaking on ‘Loose Women’ earlier today, she said she assumed their ‘family’ and ‘sex life’ were ‘perfect’.
News of her marriage troubles marriage broke earlier this week, after she spoke to, The Sun, saying: “I was gutted. For a year I was basically paying her to f*** my husband…
“When I confronted him he denied it at first, even when I said she’d admitted it. I was crying, asking, ‘How could you do this to me again?’
“My mum and his mum were both there, telling me to calm down. But when I begged him to tell the truth he finally said, ‘Yeah, we have’ …
“I was absolutely gutted and I was crying and going mad, like a lunatic.”
Katie went on to claim that she then confronted Nikki over the phone, and asked her to tell “the truth” and Nikki said he had “brainwashed her” into it.
The revelation comes just months after Katie and Kieran renewed their wedding vows in an intimate Maldives ceremony, with Nikki even sitting in the front row.
Katie says she learned of the affair when she checked Kieran’s emails on his phone while he was drunk, with the reality star being shocked when she found a series of messages labelling Nikki as “his best friend”.
Kieran is said to have initially denied the affair, before giving his sex addiction as an excuse.
Kieran is Katie’s third husband after the star previously married singer Peter Andre, with whom she has children Princess and Junior with, and Alex Reid.
She and Kieran tied the knot in January 2013.