Robert Downey Jr. and Zach Galifianakis posed with Balu the dog at the European premiere of "Due Date" held at the Empire Cinema in London yesterday.

Director Todd Phillips re-teams with his break-out "Hangover" star for the road movie concerning a soon-to-be father (Downey Jr.) and his cross-country trip to make it back in time for his baby's birth -- with the only roadblock being the dubious passenger (Galifianakis) who's along for the ride.

Michelle Monaghan and Jamie Foxx co-star in the Warner Bros./Legendary Pictures production.

Check out some "Due Date" photos here!