Liev Schreiber and Naomi Watts riding their bikes in Brentwood, Los Angeles, California - 01.02.09

Watts has singed to play secret agent Valerie Plane alongside Sean Penn in Fair Game; while Schreiber will star as Angelina Jolie's CIA boss in Salt.

And they are helping each other get into character.

Schreiber tells the New York Daily News, "Naomi and I both play CIA agents who appear normal. They aren't Hollywood's idea of a spy. We're both trying to figure out who they are."

Source: WENN