Neal McDonough will also star in the project, which is scheduled to begin filming in the fall at Hyannis Port in Cape Cod. McDonough is also the film's executive producer.
Tveit will play Johnny Manicotti/Kennedy John, a twentysomething slacker who pretends to be a Kennedy and parties on Cape Cod. John Burgess will direct from a script penned by writer and producer Ted Collins.
Tveit has also been seen on Broadway in Hairspray, Next to Normal and Wicked.