AceShowbiz - In the upcoming Netflix documentary "Martha," Martha Stewart opens up about a significant infidelity in her past. The lifestyle guru confesses that she cheated on her ex-husband, Andy Stewart, while married.

"Young women, listen to my advice," Stewart says in the trailer. "If you're married and your husband starts to cheat on you, he's a piece of s**t." When asked about her own infidelity by an off-camera producer, Stewart responds, "Yeah, but I don't think Andy ever knew about that."

Stewart and Andy Stewart were married from 1961 to 1990 and share a daughter, Alexis Stewart. The couple separated in 1987 and finalized their divorce three years later.

Their tumultuous marriage, including her alleged penchant for throwing nude parties and rumors of her verbally abusing then-husband and offering him to up for sex with a friend, was previously detailed in a book "Just Desserts" by Jerry Oppenheimer.

Stewart also reflects in the trailer on the complex relationship between marriage and career. "What's more important?" she asks. "A marriage? Or a career?" However, she admits that she is unsure of the "correct answer."

Netflix is set to release the documentary "Martha" on October 30.