Davidtz and Noseworthy will star opposite Kelli Garner and Susan Sarandon in Lifetime's four-hour miniseries, reported Deadline.
The series will premiere next year.
Based on best-selling book 'The Secret Life Of Marilyn Monroe' by J Randy Taraborrelli, it will centre on Monroe (Garner), who walks red carpets in shimmering gowns while fighting a battle against demons she has inherited from her mentally-ill mother Gladys.