The 27-year-old, who has been given just few weeks to live by doctors after being diagnosed with cervical cancer, has been battling the disease which previously reached her liver, groin and bowel.
The mum of two, who has been eagerly looking forward to her sons Christening next week, was said to have faced an hour-long surgery to mend a blockage and control her excruciating pain.
"Jade was told while in a hospice at the weekend that the cancer was travelling freely in her blood and had spread to her brain. This is, of course, awful but not unexpected. She has already been told the disease is terminal," the Sun quoted a family friend as saying.
Her rep Max Clifford had said: "Jade was taken to the Chelsea and Westminster Hospital at lunchtime for a series of tests.
"She will have surgery this evening to remove this blockage in her bowel which is causing her such pain. If it's successful, it will dramatically improve Jade's quality of life.