Naomi Watts has boarded Warner Bros.' J. Edgar, starring opposite Leonardo DiCaprio, Ed Westwick, Damon Herriman, Armie Hammer, Ken Howard and Josh Lucas in the Clint Eastwood-directed film.

According to Variety, Naomi Watts will portray Helen Gandy, the longtime personal secretary to FBI director J. Edgar Hoover. Gandy began working for Hoover in 1918 and continued in that role until he passed away in 1972.

Dustin Lance Black wrote the script.

J. Edgar Hoover was appointed director of the Bureau of Investigation in 1924 and was named head of the FBI when it was founded 11 years later.

No production date has been set.