Paul Giamatti will be making his very first appearance on the hit TV series Downton Abbey when it returns this fall.

The veteran actor has come aboard the popular British-American drama to play Cora's (Elizabeth McGovern) brother, Harold Levinson while Shirley MacLaine is back to reprise her role as Martha, in the upcoming season.

Huffington Post recently posted pictures from the season 4 set of Giamatti and MacLaine shooting a scene.

In a statement, executive producer Gareth Neame spoke highly of Giamatti, whom he feels will have great onscreen chemistry with MacLaine moving forward.

"We're excited that Paul Giamatti will be joining us on 'Downton' to play Cora's brother Harold, the rather free-spirited uncle to Mary and Edith. We can't wait to see him work alongside Shirley MacLaine, who are both sure to upset the Grantham's apple cart in this year's finale," he said.

"We can't wait to see him work alongside Shirley MacLaine, who are both sure to upset the Grantham's apple cart in this year's finale," Neame added.

Downton Abbey is set to launch in the U.S. on Sunday, Jan. 5, 2014, and go until Sunday, February 23, 2014.

Be sure to keep checking back for more of the latest info on the popular show. For more DA dirt related to the upcoming installment, a video clip can be viewed below.

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