Emma Watson was stunned to hear about her Harry Potter co-star Daniel Radcliffe's secret booze battle because he was the "most professional" actor on the set of the film franchise.
Radcliffe, who shot to stardom as the boy wizard at the age of 11, went public with his alcohol issues in the new issue of men's magazine GQ, revealing he was so worried about becoming an alcoholic he is now a tee-totaller and never drinks.
He said, "I became so reliant on (alcohol) to enjoy stuff."
But his Harry Potter castmates had no idea and Watson insists she never even considered her friend was having personal troubles because he was on top form whenever the cameras were rolling.
She says, "To be honest, it's really not something that I genuinely know much about. But as far as I know, he never took a sick day. He was like the most professional, amazing guy ever."