Robert Downey Jr. Joins Zach Galifianakis In 'Due Date'

Robert Downey Jr. gets hyped up for 'Sherlock Holmes' at Comic-Con in San Diego on July 24, 2009 Robert Downey Jr. gets hyped up for 'Sherlock Holmes' at Comic-Con in San Diego on July 24, 2009

Robert Downey Jr. will join Zach Galifianakis in Todd Philips’ “Due Date,” Entertainment Weekly reported.

Robert will star as a dad-to-be who has to race across the country in time for his child’s birth, with Zach playing what the mag called an “unlikely travel companion.”

The film will find Zach reuniting with Todd, who directed him in this summer’s surprise hit “The Hangover” – which, with over $240 million in box office grosses, has become the highest-earning R-rated comedy in history.

“Due Date” could potentially start filming this fall with a summer 2010 release in mind.

Robert just wrapped filming on “Iron Man 2,” also due next summer, and stars in the upcoming “Sherlock Holmes” alongside Jude Law and Rachel McAdams.

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