Boxing champ Floyd Mayweather's British girlfriend was left in floods of tears after thug fans of rival Conor McGregor hurled a brick through her window - wrapped in the message "f*** the Mayweathers".

Abi Clarke, 25, has suffered a campaign of abuse from vile fight fans, who are targeting the former The Only Way is Essex star in the run-up to her partner's Las Vegas showdown against the Irishman next month, The Sun reports.

Clarke was also confronted by three thugs in the street who launched a torrent of abuse, shouting: "You plastic slag ... You're loose. Mayweather's gonna die," the The Daily Star reports.

Last week a group of yobs threw a brick through the window of her Essex home with McGregor's taunting phrase: "F*** the Mayweathers" attached in a note.

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The reality TV babe and multi-millionaire Mayweather, 40, have been secretly dating for months, it emerged last week. But the news sparked a "real-life nightmare for Abi", according to a source close to the star.

The source said: "The stuff she has had to deal with has been tough to take.

"She is genuinely worried about her safety. There are concerns that the worst could happen if things get out of control."

Neighbours reportedly rushed to help Clarke, fearing she had been hurt in the attack on her Essex property. The yobs then fled the scene, leaving her in floods of tears.

A friend said: "It was horrific. Abi was understandably shaken by what happened.

"When neighbours went round to offer support she was having a panic attack.

"It had all come out of nowhere and she didn't know what to make of it. She was sobbing and shaking."

She has since been the victim of vile taunting in the streets and online. One source told The Star: "People have been shouting at her. She's also had nasty messages on Instagram."

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Clarke did not call the police after previously being told her life in the public means nothing can be done, they added.

But she still hopes to publicly support her boyfriend when he clashes with UFC lightweight champ McGregor, 29, on August 26.