'I became a little brat': Demi Lovato opens up to Ryan Seacrest about Joe Jonas, self harming and her troubled past

She has suffered through a troubled year after being very publicly admitted to rehab for 'emotional and physical issues.'
And now Demi Lovato, star of Disney Channel's TV show Sonny With A Chance, has revealed the extent of the problems which led to her seeking treatment last November.
'I became like a little brat on set,' she told Ryan Seacrest on his KIIS FM radio show this morning.
'I just had so much growing up to do, not that I ever intended to be that way. I just had so much going...