Robert Downey Jr., who is now the voice of reason and who sets a great example for old high school chum Charlie Sheen, stars opposite new Hollywood funny guy from ‘The Hangover,’ Zach Galifianakis in the new comedy ‘Due Date.’ This odd couple pairing who road trip together to get Downey back to pregnant wife played by Michelle Monaghan, who must have the luck of the Irish being that she has already starred opposite too many major leading men that you wonder how she did that, should deliver on all those odd couple chemistry driven buddy film jokes that we love so much. Directed by ‘The Hangover’s’ Todd Phillips, ‘Due Date’ from Warner Bros. opens today.