This week, Paramount Pictures and director Brad Bird will begin testing actors to star alongside Tom Cruise in Mission: Impossible 4. I’m told that three of the actors who’ll test with Cruise on Thursday and Friday are Vampire’s Kevin Zegers, Letters to Juliet star Christopher Egan, and Anthony Mackie, who starred in the Oscar-winning The Hurt Locker. Cruise is producing the film with JJ Abrams, and Paramount Pictures is co-financing with David Ellison’s Skydance.