Naomi Watts has signed up to star in Clint Eastwood's movie about FBI director J Edgar Hoover.
The British-born Australian actress has been cast alongside Leonardo DiCaprio and Ed Westwick, Variety said.
Naomi, 42, will play Helen Gandy, the longtime personal secretary to FBI director Hoover.
Helen worked for Hoover from 1918 until he died in 1972.
Hoover was made director of the Bureau of Investigation in 1924 and head of the FBI when it was founded 11 years later.
Dame Judi Dench is also set to star in J Edgar, with Leonardo playing the title role.
Naomi will be seen next in the thriller Dream House, alongside Daniel Craig and Rachel Weisz.