Married At First Sight villain Brook Crompton is facing explosive claims that her shocking dinner party behaviour was not a one-off drunken lapse in judgment.

A woman who says she went to high school with the model, 27, has revealed she attended the $33,000-a-year St Margaret’s Anglican Girls School in Ascot.

And she claims on Reddit that Brook was as much a ‘relentless mean girl’ in her elite Brisbane school days as she appeared to be on television Wednesday night.

‘I was the year below Brook. It’s not an overly large private school, so we were easily acquainted,’ the woman began in her blistering account of Brook’s school years.

‘What you’ve seen on TV is not even the tip of the iceberg of how horrid and empty these once girls and now “women” are.’

In the extraordinary takedown, the former student said Brook and her mates’ alleged bullying was so severe that multiple students were driven out of the prestigious private school.

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MAFS villain Brook Crompton, 27, is facing explosive claims that her shocking dinner party behaviour was not a one-off drunken lapse in judgment

‘Every. Single. Day. Relentless mean girl behaviour. Her and her possee, you are horrible excuses of people,’ she continued writing in her lengthy post.

‘I am talking about bullying so severe it not only led to many innocent girls leaving the school, but also caused irreparable emotional damage and carnage to innocent young girls who had no idea they had a target on their backs for simply existing.’

Brook and her co-star Gia Fleur left MAFS fans furious after their wild display at Wednesday’s dinner party.

The pair unleashed a vicious verbal attack against co-stars Stella Mickunaite and Alissa Fay.

The war of words went to some dark places, and those tuning in at home branded Gia and Brook ‘bullies’ and called for them to be cut from the reality show.

Referencing the dinner party episode, the former classmate said watching fellow bride Stella describe it as the first time she had been spoken to that way was heartbreaking.

‘When Stella explains her pain of never experiencing this putrid behaviour before, I wanted to cry and hug her,’ she said.

The former student further alleged the behaviour stemmed from a culture of entitlement.

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A woman who says she went to high school with the model has revealed she attended the $33,000-a-year St Margaret’s Anglican Girls School in Ascot

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Other alumni from the school also took to the comment section to agree with the classmate

‘These girls are raised this way, their mothers being Brisbane “socialites” or so they think, and they live in a bubble of utter delusion, drunk on power they do not have,’ she continued.

Other alumni from the school also took to the comment section to agree with the classmate.

The fresh allegations come just days after Brook attempted to repair her image with an emotional Instagram apology addressing the behaviour she displayed on TV.

‘Last night and the past few episodes of MAFS was an extremely difficult watch,’ she wrote.

‘What you saw last night was the worst version of myself, and unfortunately Alissa and Stella were on the receiving end of that.

‘I want to firstly, sincerely apologise to Alissa and Stella for my words and the hurt that I have caused.

‘My actions were appalling and not at all a reflection of the kindness and respect that you both deserve and I hope in time you can forgive me. I am truly sorry.’

Brook also addressed viewers, writing: ‘To the other couples in the experiment and audience who had to witness my behaviour, I am deeply sorry.’

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Brook and her co-star Gia Fleur left Married At First Sight fans furious after their wild display at Wednesday’s dinner party

Appearing to acknowledge the backlash, she said: ‘Bullying should never be condoned, and I am extremely embarrassed by the way that I acted.’

She also explained the dinner party was filmed in August last year and that she has since ‘had time to reflect and learn’.

‘This behaviour is not a reflection of who I am at my core. I hope that Australia will one day see this,’ she added.

But fans were unconvinced, flooding social media with calls for her removal from the show.

‘Brook is what happens when you get by your whole life on pretty privilege. No need to develop moral character,’ one viewer wrote.

Another added: ‘Brook’s behaviour has been soooo appalling.’

Others demanded producers intervene, with one posting: ‘Love MAFS, but I’m not interested in watching relentless bullying… such disgusting and embarrassing behaviour.’