WOODBURY - Food Network television star Sandra Lee has announced she's been diagnosed with breast cancer.

The 48-year-old celebrity chef is the live-in partner of Gov. Andrew Cuomo. She made the announcement during a tearful interview that aired this morning on ABC's "Good Morning America."

Lee says that she found out about the cancer last month after a routine mammogram. She has since had a lumpectomy, but will undergo a double mastectomy this week.

Cuomo released a statement supporting Lee's decision to speak publicly.

"While she has kept her illness private until now, Sandy has bravely decided to speak openly about her illness in order to remind women of the potentially lifesaving power of early detection," said Cuomo.

Cuomo plans to take some personal time to support Lee as she recovers.

Lee reportedly has no family history of the cancer.

Relatively new federal guidelines recommend women start screening for breast cancer with mammograms at 50 years old. The American Cancer Society recommends the first test at 40.