The "Web Therapy" star revealed recently she had seen an announcement that the reunion for the show's 10th anniversary was confirmed.
"The graphic for this one thing was unbelievable. It looked really real," Kudrow explained. "And then they were posting this article and the headline was like, 'NBC Confirms 5 out of 6 of the Friends Are In,' and I went, 'Oh my God. They didn't ask me.'"
After she realized her mistake, Kudrow said she felt terrible for the fans of the show, which went off the air in 2004.
"I honestly just feel really bad just by saying, 'And that was actually never something that was ever going to happen.' You're disappointing them," she said. "And people got mad at me recently because I had said, 'No, no. That's never going to happen.' They were angry, like I'm the one who shut it down."
If it ever happened, though, Kudrow said "of course" she would be in.