A lot of athletes have star quality, but they just can't perform in front of a camera. So no matter how good-looking you are, no matter what kind of presence you have, you still have to be able to be a convincing performer to become a star.
Star quality is one of the most difficult things to describe. It emanates from the person, and he may not even understand it himself. It's a quality that separates the star from the rest of us.