Who played the less than lucky mother in 'Rosemary's Baby' from 1968?

Explanation

Roman Polanski's international breakthrough with the 1968 film 'Rosemary's Baby' is viewed as one of the best horror films ever by many critics. Mia Farrow plays a mother-to-be who has to live through several peculiar occurrences. A year after, in 1969, Roman Polanski had his own personal nightmare when his wife, Sharon Tate, who was heavily pregnant, was brutally murdered by the Manson Family.