Watts fascinated by 'tragic' Diana

Naomi Watts is fascinated by Princess Diana because her life was "filled with tragedy".

The 44-year-old actress portrays the late British royal - the ex-wife of Prince Charles and mother of Princes William and Harry who died in a Paris car crash in 1997 - in forthcoming biopic 'Diana' and she admits she was attracted to the role because of the "contradictions" in the princess' life.