Karen Danczuk cheated on her MP husband with a car salesman during their marriage before it collapsed last month, it was claimed last night.

The alleged affair is the latest in a string of sordid allegations that have been revealed since her split from Labour backbencher Simon.

The mother-of-two, who has risen to fame by posting busty pictures on Twitter, reportedly told the man she was in love with him during hours of conversations, it was reported.

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Karen Danczuk, pictured, cheated on her husband with a car salesman it was claimed last night

The mother-of-two, pictured, is claimed to have sent topless photographs of herself to the man

She also posed in sexy lingerie on her marital bed while her husband was away on business.

The Sun newspaper revealed the details of an intimate relationship she enjoyed with the car salesman who thought she was ‘the one’.

They bombarded each other with texts and emails — and Mrs Danczuk allegedly sent him the topless selfie with a raunchy message about what she wanted him to do to her.

Last night a source told the Sun: ‘Karen told this fella she was madly in love and he fell for her big time.

‘They talked about a future together. She said she didn’t love Simon.

‘They even talked about having babies, buying a place together in the countryside and travelling all over Europe on fabulous holidays.

‘She promised almost every day that she would ditch Simon and this poor bloke believed her.

‘He was smitten and genuinely believed she had feelings for him. But after a while he realised she wasn’t going to leave her husband so he ended the relationship.’

It was reported last night that Mrs Danczuck, left, said she would leave her husband, Simon, right, for the man

Mrs Danczuk reportedly met the salesman though social media. He was a fan of her selfies and within hours the pair had exchanged phone numbers.

The source added: ‘It wasn’t long before he started seeing her while Simon was away in London.

‘Everyone knows Karen is famous for her selfies but she’s never done a topless one — so you can imagine how this bloke felt when she whipped off her bra just for him! It’s a bit of a collector’s item.

‘She loves sending saucy snaps and was well flirty and suggestive in her texts. One time she stripped to a bra on her bed and he couldn’t believe his luck. The word exhibitionist doesn’t do her justice.’

Yesterday when The Sun asked Mrs Danczuk to comment the fling, she said simply: ‘Let me have a think about it.’

The revelations come just three days after she appeared on TV to deny she had ever cheated on her 48-year-old husband.

Last week, it was reported Mrs Danczuk spent the night with her personal trainer just days after announcing she was separating from her husband.

Fitness instructor Ben Bate was photographed leaving the couple’s marital home in the early hours of the morning.

Both parties denied they were having an affair despite allegedly spending the night at Mrs Danczuk’s home.

Responding to the claims last week, Mrs Danczuk said: ‘Seriously, I am not having an affair. Ben has been an amazing friend.

‘We have had to speak more these days because everyone has been accusing us of having an affair.’

In an interview, she insisted that their split was a result of her newfound fame, and claimed that Mr Danczuk had grown ‘jealous’ of her.

She said: ‘I used to be his plus-one, but it changed dramatically...Even at MP events, I became the star.’

Karen, who has 64,000 Twitter followers, has continued to deny any wrongdoing and has accused Simon of being ‘arrogant’ and an ‘alcoholic’.