Seth Rogen and Michelle Williams to star in The Waltz Seth Rogen and Michelle Williams have signed on to star in the romantic comedy The Waltz. The pair will play a couple involved in a torrid love triangle. The third member of the trio has yet to be cast. The Waltz will bedirected by John Adams actress Sarah Polley. The film’s script reportedly made the 2009 Hollywood blacklist of best unproduced screenplays.