She made the announcement on Instagram with a heartfelt message paired with a picture of herself smiling.
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"Beautiful friends, I want to share with you that this last week I was diagnosed with breast cancer," she wrote.
Crenn acknowledged that one in eight women have breast cancer, and shared a token of inspiration for them too.
"For all the women who have been on this journey before me and now with me, my heart is with you," she wrote.
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Crenn says she is going to remain in her kitchen as much as possible while she fights the disease.
She has three restaurants in San Francisco, Atelier Crenn, which won a Michelin award, Petit Crenn and Bar Crenn.