The teenager, who Cheryl mentored to the final in 2010, also blasted the Girls Aloud star for using AuoTune on her records.
The Swagger Jagger hitmaker claimed it was nearly impossible for Cheryl to sing live, adding: “Well it is nowadays, when you haven’t got the nifty little button to press!”
Cheryl hit back on Twitter earlier this week with a sly dig, writing: "Be Careful who you kick on your way up .. They kick you twice as hard on your way back down.. #unappreciationisugly"
Now friends of the former X Factor judge say she's been hurt by the youngster's comments
“After everything Cheryl has done for her, she does that. What a total brat,” a friend told the Daily Star today.
They continued: “But she’ll learn the hard way. Cheryl’s been in the industry for a long time, Cher is only just starting.
"She needs to keep her attitude in check.”