The 48-year-old shared the heart-breaking news in a post on Instagram on Wednesday and added that she is working closely with her medical team on a treatment plan

Trump, 48, is the ex-wife of Trump's eldest son, Donald Trump Jr. They have five children together.

Vanessa Trump, the former wife of Donald Trump Jr shared that she'd been diagnosed with breast cancer, prompting former sister-in-law Ivanka Trump to react.