Warner Bros. And Legendary Pictures are to release "The Hangover", a comedy starring Heather Graham and Justin Bartha. We know Bartha best for his character in "National Treasure" series.

Directed by Todd Phillips, this film follows the story of three friends played by Bradley Cooper, Ed Helms and Zach Galifianakis who lose best friend (Bartha) while celebrating his bachelor party at Caesars Palace just before his wedding.

Galifianakis recently appeared in "What Happens in Vegas" with Ashton Kutcher and Cameron Diaz.

Production for this film will begin this week in Las Vegas.