Shannen was on ABC's GMA today to announce, heartbreakingly, that her breast cancer, that had been in remission, that round one of occurred in 2015, has returned - and that it's now stage 4.

GMA article and interview video

Shannen, who's 48, says that the cancer returned a year ago, and that she's remained mum about it all this time, but that she realizes it's time to disclose it publicly as the predicament will be mentioned in court documents that are set to be publicly released within the coming week or so; she wants people to hear her news and her story directly from her, rather than via those documents.

Sending prayers and best wishes her way.