Two X Factor wannabes insulted temporary judge Natalie Imbruglia, when she sat in on the Birmingham auditions this week.

Pop songtress Natalie was sitting in for regular judge Dannii Minogue on Sunday, when the two teenagers took to the stage. Abbie and Lisa, began their rendition of Shayne’s Ward’s ‘That’s My Goal’. One girl was unhappy with how the song was progressing and so just a few lines in, she threw the microphone at her friend and stormed off stage.

An audience member told The Sun: “They had only been on for two seconds when one got the hump, chucked the microphone in the other’s face and stormed off.

“She eventually came back and they started to sing. Simon stopped them and said one was better than the other, but they were both pretty awful. Natalie piped up that they weren’t very good and one of them just snapped, “Sorry, who are you?”

“Poor Natalie couldn’t believe it and Simon told them they had a bad attitude.

“As they were going off one started elbowing the other.”

An X Factor spokesperson said: “Things got a bit heated. Producers quickly stepped in.”