Downey and Galifianakis Starring in Due Date

After Iron Man and The Hangover, Robert Downey Jr. and Zach Galifianakis are two of the hottest names in Hollywood, so it's no shock that Warner Brothers have recruited the two to star opposite each other in Due Date.

The buddy comedy will have Downey playing an expectant father on a road trip with a mismatched partner (Galifianakis), as they race to get to the birth of his first child.

Production is set to begin this fall.