'Downton Abbey' Season 4 adds Paul Giamatti to the finale

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paul-giamatti-downton-abbey.jpgA new U.S. actor has been added to the cast of "Downton Abbey" Season 4 -- albeit for only one episode -- but viewers will finally get a glimpse at Lady Cora's ( Elizabeth McGovern) stateside brother, Harold, when Paul Giamatti shows up in the Season 4 finale with Shirley MacLaine, when she reprises her role as Cora's mother, Martha Levinson.

PBS has announced (as first reported by TV Line) that Giamatti will appear as Cora's "maverick, playboy brother" Harold, who comes to Downton with his "free-spirit" ways and both he and Martha "upset the Grantham's apple cart."

We aren't sure the first two words that come to mind when thinking of Paul Giamatti are "maverick playboy," but he's a terrific actor and it should be a lot of fun.

"Downton Abbey" premieres in the U.K. in September and in the U.S. Jan. 5, 2014.
Photo/Video credit: Getty Images