Demi Lovato slams Justin Bieber at X Factor auditions

Demi Lovato, who currently is burning up the charts with her hit 'Heart Attack', dissed Justin Bieber during 'X Factor' auditions this week.

A source told TMZ.com that Lovato spoke disrespectfully when a 22-year-old contestant was giving off a bad attitude on the campus of USC on Wednesday.

Lovato reportedly told the participant that the music industry already has enough rude artists in it and it doesn't need another little punk running the streets.

Her next shot was less subtle, when a young man auditioned with Bieber's own song, "As Long As You Love Me."

It has been revealed to the publication that though the audience and judges loved his performance, Lovato remarked that someone could finally sing the song the way it was meant to be sung.