Seth Cohen is about to get a lot more popular. Adam Brody — the actor behind The O.C.'s breakout geek — has landed a supporting role in the Brad Pitt&#150Angelina Jolie thriller Mr. and Mrs. Smith. In the film, Pitt and Jolie star as a married couple who discover that they are assassins hired to kill each other. According to The Hollywood Reporter, Brody's character gets kidnapped early in the film only to return home just in time for Chrismukkah.