New Delhi, Sept. 26 -- The Diplomat has a happy surprise for fans. Allison Janney and Bradley Whitford have been promoted to series regulars for the Netflix show's fourth season, according to Deadline. In the third season, which will premiere on October 16, both Emmy winners will appear as guest stars.

Janney plays US Vice President Grace Penn in the series. In the upcoming season, she will go on to become the President of the United States. Meanwhile, Whitford will portray First Gentleman Todd Penn, Grace's husband.

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The second season ended with the news of the death of President Rayburn, played by Michael McKean. Whil...