Ed Westwick has reportedly landed a major role in Clint Eastwood's J Edgar.
The Gossip Girl star would play Agent Smith, who is hired to write the biography of the FBI director in the forthcoming biopic starring Leonardo DiCaprio as Hoover, according to Deadline.
Charlize Theron will not be playing Helen Gandy, Hoover's personal secretary, as previously rumoured because she is now signing up for Snow White And The Huntsman.
Naomi Watts and Amy Adams are tipped as potential actresses to take the role.
Rounding off the cast for J Edgar are Dame Judi Dench as Hoover's mother and The Social Network's Armie Hammer, who is to play Hoover's assistant and secret lover Clyde Tolson.