James Arthur has had a go at Simon Cowell ... which is probably not the best idea, considering he's his boss!
It's after recent reports that a character in the X Factor musical "I Can't Sing!" is based on James. He posted a link to the article on Twitter, saying "@SimonCowell I should 'shut up and put out records' or else this?"
He then added "Cue more medial bullying."
Last we checked, James was signed to Simon's label, Syco Music... he might want to be careful!
