All four of the Jonas Brothers have signed on to make their big screen debut in "Walter the Farting Dog." The teen pop sensations will be filming with their younger brother Frankie, aka the "Bonus Jonas," when they start shooting in Spring 2009. The young heartthrobs are cast as musicians whose sickly great aunt asks them to care for her incredibly smelly canine, inevitably leading to a series of misadventures. The film is based on a bestselling book series by William Kotzwinkle and Glenn Murray, and has been developed by the Farrelly Brothers, who directed such movies as "Dumb and Dumber."

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