Real Housewives of Salt Lake City's controversial star Mary Cosby is accused of using a cruel slur against Lisa Barlow's young son while filming season five of the hit show.

Cosby allegedly called Barlow's child Henry, 12, the R-word during an explosive clash on camera. 

The 'crazy fight' happened earlier this month, with cast members Heather Gay (who recently said body positivity is a big lie) Whitney Rose, Meredith Marks and Angie Katsanevas said to be 'perturbed' by Cosby's remarks.

'The entire cast … was beyond grossed out,' a source said, noting that Barlow was, 'very upset' about what Cosby said. 

A rep for Cosby said only that Mary 'is on hiatus right now' from the show. DailyMail.com has reached out to Bravo for further comment. 

A Bravo rep later clarified that Cosby is, 'on hiatus from her rep, not the show,' though would not comment further. 

Filming is under way on Season 5 of Bravo's Real Housewives of Salt Lake City , with a new report claiming a vulgar altercation took place.

A new report from Page Six alleges that RHOSLC star Mary Cosby called Henry, the 12-year-old son of Lisa Barlow , the R-word.

Barlow shares the 12-year-old (middle right) - who she affectionately calls 'Baby Gorgeous' - along with his older brother, 19-year-old Jack (middle left), with husband John Barlow (left).

Barlow shares the 12-year-old - who she affectionately calls 'Baby Gorgeous' - along with his older brother, 19-year-old Jack, with husband John Barlow.

Another source claims that both Cosby and Barlow have put the incident behind them, and they are both currently filming a cast trip in Puerto Vallarta, Mexico.

'They made amends over the situation and are moving on,' the insider contends of the incident.

There is no indication yet if the incident will be featured this season when the show returns to Bravo.

This is not the first time that Cosby has come under fire for insensitive remarks on Real Housewives of Salt Lake City.

She called former castmate Jen Shah a 'Mexican thug' in Season 2, though Shah is of both Hawaiian and Tongan descent.

Cosby did apologize to Shah, who was later removed from the show after she was arrested for wire fraud and money laundering. 

'I would like to take this opportunity to address a comment I made on the last episode of ‘RHOSLC.’ I used poor judgment in my choice of words. Please accept my apologies,' Cosby said.

'I was not trying to single out the Mexican culture. I am African American and I know racism first hand,' she continued, adding her words were, 'reckless.'

Just a month later, Cosby made another racially-insensitive remark, saying she liked Season 2 cast member Jennie Nguyen's, 'slanted' eyes.

Lisa Barlow is all smiles with her 12-year-old son Jack

Another source claims that both Cosby and Barlow have put the incident behind them, and they are both currently filming a cast trip in Puerto Vallarta, Mexico .

'They made amends over the situation and are moving on,' the insider contends of the incident

This is not the first time that Cosby has come under fire for insensitive remarks on Real Housewives of Salt Lake City

Nguyen, who is of Vietnamese descent, said in confession, 'What the hell? Did Mary just say she likes my slanted eyes? Does she not know it’s inappropriate?'

Nguyen, who is of Vietnamese descent, said in confession, 'What the hell? Did Mary just say she likes my slanted eyes? Does she not know it’s inappropriate?'

Cosby has also been accused of running her church - Faith Temple Pentecostal Church - like a 'cult,' though she has denied those allegations.

Cosby was a main cast member in Season 1 and 2, before leaving in Season 3 and returning as a 'friend' in Season 4.

Her status for Season 5 has not yet been confirmed at this time, and it's unclear when it may debut on Bravo.