The star was given her diagnosis three weeks ago, after finding a lump in her breast.
While her initial mammogram showed nothing concerning, a biopsy confirmed it was breast cancer, meaning she will need to have a mastectomy.
The property star admitted she had been expecting her diagnosis, as her own mother had died at the age of 39 after her breast cancer had spread to her brain when Sarah was just 10 years ol
Recalling her diagnosis, Sarah said: “The nurse was so sweet and they were really nice to me but I thought, ‘You don’t understand.
“‘I have waited 40 years to hear those words.’ I knew I was going to hear it one day,” she told The Telegraph.