Warning: This article contains language and/or sexual references that younger readers are advised to avoid.

Kerry Katona has been accused of cheating on husband Mark Croft when she was planning their wedding.

Leighton Ogden, 20, has claimed that the former Atomic Kitten singer and Celebrity Mother of the Year visited his home after an argument with Croft in June 2006, just months into their engagement. Ogden added that she had previously been unfaithful to Mark with him in February of that year; performing a sex act on him behind a Tesco in Warrington after a night out.

"Kerry and me got together in June last year. She and Mark had a huge barney and she came round to my place to drown her sorrows," Ogden told the News of the World. "I got us some cocaine and some pills and we were soon having a huge session.

"I chopped up the Charlie [cocaine] and we snorted line after line. We also did the ecstasy just so we could get really wasted. We'd always fancied each other and there was always a bit of sexual tension when we were together. But this time Kerry had the massive hump with Mark. She wanted to teach him a lesson - and she did it by getting off with me."

Katona won back temporary custody of her daughters Molly and Lilly Sue this week. However, Ogden does not believe that she is a fit mother, and thinks that Kerry's ex-husband Brian McFadden should be awarded full custody.

"It's hardly a great environment to be bringing kids up," he said. "She's a terrible mother and a terrible wife."

Kerry married Mark in February this year, but their relationship has been in trouble recently, following reports that he had slept with former girlfriend Clare Bonello.