X Factor hopeful Grace Davies was once questioned by police after she ''attacked'' a friend in a ''violent row over an iPad", it has been reported.
The 20-year-old singer-songwriter from Blackburn – who has acquired a reputation for her diva-like behaviour towards crew members on the ITV show – allegedly ''kicked off'' with the male friend during a drama class.
The pal told The Mirror: "Grace has so much talent, but she is such a disgusting person."
Another insider added: "During a drama class she saw red over something tiny and lunged for another student. There was a scuffle and the police were called."
Confirming the incident, a police spokesperson told the newspaper: "We were called to an assault at St Mary's College, Blackburn on 19-3-15, in which an 18-year-old male student said he had been attacked by an 18-year-old female student.
"No-one was charged in respect of the complaint and a community resolution was agreed between the parties."
News of the latest report came come as a shock to Grace fans, as the star has been portrayed as sweet and humble. In her defence, a source close to the star said she is "mortified about how she overreacted" and regretted the attack, which took place before stressful exams.
It comes as Grace has been accused of being snippy with members of the X Factor crew, and is apparently acting as if she has already won.
An X Factor source told The Mirror earlier this week: "Grace acts like she has already won and is a big star.
"All her manners seem to have gone and since winning the opening week she has developed a bit of an attitude. It needs to stop."
Davies – who is being mentored by Sharon Osbourne – was overshadowed last weekend by boy band Rak-Su and winner of the week Kevin Davy White.
It is suggested that the stress of no longer being at the top spot may have taken its toll on Davies, with the hopeful apparently being rude and speaking down to production staff.
Meanwhile, there has been more behind-the-scenes drama on X Factor as the previously scheduled four eliminations for this weekend have been cancelled.
Simon Cowell stepped in to shake things up for this week's live shows and wants to give the public more time to get behind their favourites.
A source close to The X Factor told The Sun: "There is some great talent on the show this year.
"Simon thinks it's unfair to cut the numbers so drastically when contestants are doing so well."
They added: "Talent this year is exceptional and with less weeks of live shows producers want to give them more time to shine and more time for the audiences to pick their favourites."
The X Factor airs tonight at 8.10pm on ITV.