Entertainment Tonight" has exclusively learned that Natalie Cole has been hospitalized in New York. A close family source tells ET, "She's had a setback and has gone into the hospital."

Just last week, Natalie came to the ET set to talk about her battle with hepatitis C, saying, "This is a virus that was dormant in my body for 25 years. I had no symptoms, was feeling great, working out like a crazy person -- and this just keeled me over, like a feather."

At the time of our interview, she was still being treated for the disease.

"What I have is treated with chemo ... every week," she says, adding that she experiences the traditional side effects from the treatment, such as nausea and her hair falling out.