Actor Paul Giamatti joins ‘Downton Abbey’ as playboy brother

Cast member Giamatti arrives for the premier of the film Cosmopolis in New YorkLONDON (Reuters) – American actor Paul Giamatti is joining the cast of the British award-winning stately home drama "Downton Abbey", starting with the Christmas episode, the show's producers said on Monday. Carnival Films, a division of Comcast's NBCUniversal, and British television channel ITV said Giamatti would play Cora Crawley's maverick, playboy brother Harold in the Christmas episode. …