In an upcoming Netflix documentary, Martha Stewart will make a startling confession about her previous marriage, according to reports news.

The 83-year-old 'lifestyle expert' has revealed she cheated on her ex-husband Andrew Stewart, to whom she was married for nearly three decades.

“Yes, but I don’t think Andy knew about it at all,” Stewart said in the documentary when asked if she had an affair early in her marriage.

The couple married in 1961 and had a daughter, Alexis, in 1965, before divorcing in 1990. Stewart describes the divorce as a “terrible thing” for her.

-The fact that we haven't talked since the divorce is even more painful. But I'm very strong, and I'm very motivated to move forward in life, she says in the documentary.

The documentary, titled “Martha,” explores Stewart’s life through a series of intimate interviews. It follows her journey from teenage model to America's first self-made billionaire in 1999.

Viewers will also see how the TV personality rebuilt her image after serving prison time for insider trading in 2004.

“I could have been a miserable, outdated housewife, but I didn't let that happen to myself,” Stewart says in the documentary.

“Martha” will premiere on Netflix on October 30.