The actress was a guest on Howard Stern's Sirius Xm radio show on July 30 and shared that she and her former friend and co-star Jennie Garth are no longer speaking.
"We had a falling out and we grew apart," Thiessen said on the program (via E! Online). "I was the one who was hurt, let's just say that. I was the one who was hurt."
This isn't the first time news of a Thiessen-Garth feud has made the rounds. In May, sources told Us Weekly of a nasty 2009 run-in between the two at a party, where Garth reportedly wouldn't even look at Theissen, who served as a bridesmaid in Garth's wedding to her (now estranged) husband Peter Facinelli.
But Garth isn't the only former co-star Theissen isn't BFFs with these days.