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E! personality Giuliana Rancic, 37, announced Monday morning that she has breast cancer.

The reality star and host revealed on Today that doctors discovered the cancer when giving her a mammogram as part of IVF treatment -- Rancic has been public with her multi-year struggle to get pregnant. She said of the discovery:

    "It was just a kick in the stomach ... I was just a few days away from going to Colorado to get IVF ... It was incredible, instant sobbing ... 36 years old, no family history ..."

Rancic said she must undergo surgery and six weeks of radiation therapy, but that because the cancer was caught early, her prognosis is good. She will then continue her quest to become pregnant.

    "I still want this baby ... this baby has saved my life. I truly feel God was looking out after me … If I had gotten pregnant later down the line, I could have been a lot sicker."

Rancic was visibly shaking through her emotional interview with Ann Curry -- watch above.