Shocking Turn In Health For Celeb Chef Sandra Lee — 'My Doctor Called And Told Me I Had Breast Cancer'

"That's just how fast life turns -- it turns on a dime," she said.

Lee, who's been dating 57-year-old New York Gov. Andrew Cuomo for a decade, she said the politician has been "extremely supportive" in the wake of the life-changing news.

Lee said that her doctors performed a lumpectomy on her, after which they, along with her radiologist, advised her to get a double mastectomy.

"And so I said, 'OK. If I'm going to have a mastectomy, am I supposed to just get one done?' Both the radiologist and the doctor said, 'You're a ticking time bomb,'" she said. "And they both said, 'You need -- I would just get them both done.'"

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Lee said Cuomo will "be in the operating room with" her when she undergoes the procedure.

Lee stressed that regular checkups helped her discover the life-threatening condition, and that she's going to encourage friends and family to keep in the know about their health.

"I'm 48 years old," she said. "I've got -- I've got a couple years till 50 ... if I would have waited, I probably wouldn't even be sitting here.

The TV personality told People she plans "to spread the word about early detection" moving forward.