There's nothing wrong with Demi being nervous. This is her highest profile gig EVER. A lot is on the line. She probably feels a lot of pressure to do well. I'm sure the nervousness will subside as time goes on and she'll be more comfortable.
I'd really appreciate if people would stop saying "She's trying to be Simon" or "Britney's gonna be Paula." These girls are their own people. They have their own opinions and will say whatever comes to them in the moment. They aren't "trying" to be anyone other than who they are.
he usually says something rude instead of constructive. But as long as Demi keeps her critique constructive then she will be fine. 
