Robert Downey Jr. in 'Iron Man 2'Look out, Tony Stark and Sherlock Holmes, your master will soon be an expectant father. Robert Downey Jr. is set to star in Due Date, according to Variety, a comedy that will be directed by Todd Phillips. Downey will be teamed with Zach Galifianikis, who gave a sharp performance in The Hangover for Phillips.

Last year, Jessica Barnes reported that Due Date "centers on a first-time father and burgeoning workaholic whose wife goes into labor while he is stuck hundreds of miles away in a snowstorm. The only way he can make it to the birth in time is by hitching a ride with a college student." Obviously, Galifianikis' character is now described as a "mismatched partner" for expectant father Downey.

In an interview with Cinematical, Phillips said that neither Old School 2 nor The Hangover 2 were ready to move forward, so perhaps he already had his eye on this project. Both Downey and Phillips have a lot to live up to: Downey was nominated for an Academy Award in his last comic role (Tropic Thunder) and Phillips is coming off a film that recently became the highest-grossing R-rated comedy of all time. But put Downey and Galifianikis together on a cross-country road trip with the clock ticking, under Phillips' direction, and it sounds like a good bet that the movie will be funny as hell. Filming begins in September, ranging from Atlanta to Arizona to Los Angeles.