X Factor contestant Rachel Hylton shocked Simon Cowell when she shouted at him over his nasty comments.
The former drug addict, 26, had a go at the judge during the boot camp stages of the ITV show.
‘Rachel has an attitude, to say the least, and Simon called her out on it when she was on stage at boot camp,’ a source tells The Sun.
‘He made some comments about her performance and Rachel got lippy, Simon told her to keep the cheek down.
‘But Rachel didn’t take too kindly to Simon’s comments and she snapped. She yelled back at him and was in a real huff.’
Rachel impressed the judges in the auditions with her rendition of Amy Winehouse’s I’m No Good.
The boot camp episodes are set to air this weekend.
SEE VIDEO Rachel Hylton wows the judges on The X Factor