|Amir Khan and his wife Faryal Makhdoom|
The boxer, from Bolton, who is worth £23million, this afternoon astonishingly claimed she had an affair with heavyweight champion Anthony Joshua.
But the model, 26, hit back on social media, claiming her husband is lying and that he is a 'cheater'.
The couple were together on holiday in Dubai to celebrate Faryal's 26th birthday last week, but it's understood that Faryal has since flown back to England herself.
Joshua, 27, laughed off the claims by posting a video of Shaggy's hit single It Wasn't Me.
He then tweeted: 'Bantz aside, I hope you guys can resolve your situation or this is a hack as we have never even met! Plus I like my women BBW #ItWasntMe'
A Khan family source told MailOnline: 'Amir and Faryal have split up. It's over. There have been problems in the relationship for a long time and they were headed for a separation. It's the best outcome.'
In a series of tweets today, Olympic champion Khan, wrote: 'So me and the wife Faryal have agreed to split. I'm currently in Dubai. Wish her all the best.
'Faryal moved on quick. Always mentioned to me how much she wanted to be with another guy, from all people another boxer.
'Lol moved up in the weight classes lol. Trust me I ain't the jealous type. No need to send me pictures of the men your talking to #disgusted
'Left my family and friends for this Faryal. I'm not hurt but another fighter. I'm making it public. You getting the divorce #Golddigger
'Mans like Joshua can have my left overs!'
Within minutes, Faryal hit back on her own Twitter account and accused him of cheating on her.
She wrote: 'I'm sure you left your family because they robbed you? Not because of me. Stop making false things up.
'Accusing other boxers just because your boxing career is finished. Man up amir.
'After all these years. I've always defending a cheat, always stuck around for him, always had his back. And I'm called a gold digger?
'LOL! He's given me jack s**t -- I pay house bills and bills for my daughter myself! It's like I'm a single mother while he's out messing around. And he has the nerve to blast me like that?
'The amount of evidence I have on you. It can destroy you. But since I loved you at one point in my life. I'll just let it go.
'I'm not the one who's been in the papers every month with my pants down. Cheater!
'You have actually lost it. Wtf where do u make this stuff up from? And maybe your boxing career is finished because you're an adulterer.'
'At the end of the day I can hold my head high knowing I've given this marriage my 100% while amir clearly hasn't. Bad company.
'Bad role model, always around women , alcohol and then he calls himself a Muslim and runs a charity.
'I'm sorry to all the fans & family hurt by this. But amir did not need to do stupid tweets accusing others when he's in the wrong. #guilty
'I think he just needs some attention because boxing hasn't been going well for him so he's just been acting up #30yearoldbaby
'Sometimes people don't like it when you give them a taste of their own medicine.'
The news came after the couple ended their bitter six-month public feud with Khan's family.
|Amir Khan and Anthony Joshua|
'Amir was almost held hostage by in laws and was given 'either with us or against us' situation to decide between his family and in laws.
'That's tragic. It was clear from very early on that Faryal is interested in Amir's money and fame and we told Amir so that she's a bad choice.
'We all make mistakes. It's good Amir has reached to the conclusive fact that she's a cheater, selfish and greedy. This was bound to happen.
'She he has been caught out, Amir has known for long she loves showing flesh to men and being interested in praise by random men and confronted her.
'They found twice in America when Amir asked her to be modest, she issued threats to Amir and demanded 60 per cent share in property. For the last five months or so she only talked about share in Amir's wealth and nothing else.'
Make-up artist Faryal has had a tumultuous few months in which she became embroiled in a huge row with her husband's family, claiming they accused her of being a gold digger and dressing in an un-Islamic fashion.
The couple were hit by further drama when a sex tape of Khan performing a sex act on a webcam while chatting with a model was leaked to a US porn site.
Earlier this year, Faryal gave her sports-star hubby an ultimatum to choose between her or his family after months of infighting and rows.
Faryal banned the boxer from attending his younger brother Haroon's wedding because she still can't forgive him for comparing her to Michael Jackson.
The sex tape, which was reportedly leaked to a major US porn site, featured the former world champion boxer carrying out a sex act while speaking to a female model on Skype.
The Khans appeared on This Morning in March to claim that the webcam footage of Khan was made before they met.
The couple, who live in Bolton, Greater Manchester and married in the US 2013, also suggested it was leaked out of spite by someone once 'close' to them.
To add a further blow, Amir's father revealed he would never talk to Faryal ever again after he was 'humiliated' following his sacking as the boxer's manager.
Mr Khan has always managed his son's professional career, seeing him through the ups and down of the 30-year-old champion boxer's life.
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