The outdoors lover added she hoped she caught her cancer early enough to treat it.
Julia also noted that while a mastectomy is “shattering”, it meant being there for her children.
The presenter has three kids; Zephyr, 10 and twins Xanthe and Zena, both six.
The Countryfile star went on to say she is focusing on surgery to fight the disease and carrying on with life.
“I still need to be a mum to my kids, a partner and a working woman,” she said. “I’m still Julia.”