Maggie Smith's sarcastic Dowager Countess may be the star of British period drama "Downton Abbey," but the award-winning actress says she has never watched the TV series, Reuters reports.

Smith, 78, who has won two Emmy Awards and a Golden Globe for her role as the acid-tongued Lady Grantham, tells CBS' "60 Minutes" in an interview airing Sunday that she is amazed by the popularity of the show both in Britain and the United States.

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Asked whether she is proud of "Downton Abbey," Smith said, "I haven't actually seen it. So I don't, I don't sit down and watch it," she told CBS' Steve Kroft, according to an excerpt

Smith, known as a perfectionist, said that watching herself would make her worry about her performance. "It's frustrating. I always see things that I would like to do differently and think, 'Oh, why in the name of God did I do that?' "

"Downton Abbey," a drama about the lives of aristocratic Brits and their servants in the early 20th century, attracted 7.9 million viewers for its third season premiere in January on U.S. television. The third season ends Sunday night.

Smith's snobbish Countess of Grantham and her withering remarks like "No one wants to kiss a girl in black," have made her the show's biggest star. Smith also acknowledged her reputation as an actress who doesn't suffer fools gladly. "Old people are scary and I have to face it, I am old and I am scary and I am very sorry about it, but I don't know what you do," she quipped.