The heavily pregnant 'King Kong' actress Naomi Watts has already been signed to play Draco Malfoy's villainous mother Narcissa in "Harry Potter and the Half Blood Prince".
The Australian star will begin filming the sixth installment of the wizard series in September.
Naomi will be joined by the British actor Joseph Fiennes who is Ralph Fiennes's brother and will play Harry's arch enemy Lord Voldemort.
Naomi is expecting her first child in a few weeks time which will leave her plenty of time to get back into shape before shooting begins.
"Harry Potter and the Half Blood Prince' will be directed by David Yates and is due to be released in November of next year.
