Valerie Harper, best known for her role as Rhoda Morgenstern on 'The Mary Tyler Moore Show' and its titular spin-off 'Rhoda,' has been diagnosed with terminal brain cancer. But she's determined to live her last months to the fullest.

On Jan. 15, Harper was told she had a leptomeningeal carcinomatosis, a rare condition in which cancer cells invade the fluid surrounding the brain. She was informed by doctors that she had a mere three months left to live.

The 73-year-old Harper, a non-smoker who beat lung cancer in 2009, told PEOPLE, "I don't think of dying. I think of being here now ... I’m well past my expiration date already."

Golden Globe recipient's courage and determination has received praise and well wishes from her colleagues in the entertainment community.