Director/star Ben Stiller brings James Thurber's classic novel to life in The Secret Life of Walter Mitty. Today, we have the third trailer for this adaptation, which co-stars Kristen Wiig, Sean Penn and Adam Scott, along with the latest poster where Walter has taken over Times Square in New York City. Stop dreaming and start living when this upcoming drama hits theaters December 25.

<strong><em>The Secret Life of Walter Mitty</em></strong> Poster