Former "Entertainment Tonight" correspondent and "Dancing With the Stars" co-host Samantha Harris says she will undergo a double mastectomy after being diagnosed with breast cancer.

Harris, 40, had detected a lump in her right breast last fall, she told People magazine Wednesday. Though a mammogram done shortly before had been clean, she remained troubled and visited a specialist months later, she said. A needle biopsy and a lumpectomy detected breast cancer. The procedure is scheduled for later this month.

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She made the decision, Harris told "ET" Wednesday, after consulting with three specialists. "I was sick of feeling the way that I did in the days after the diagnosis," she said. "I knew I needed to take control."

Harris and Michael Hess, her husband since 2005, have two daughters, Josselyn, 6, and Hillary, 3. "All they're concerned about is to have mommy active, [to] be able to hold them, hug them, kiss them, be there, be present for everything," she told "ET."