Watch: Kate Middleton and Jessie J Have Emotional Moment After Bonding Over Cancer JourneysJessie J is sharing more about her difficult health journey. The "Price Tag" singer, 37, was diagnosed with Wolff-Parkinson-White syndrome-a congenital heart condition-as a child, and this past March, she was diagnosed with breast cancer. However, she's recently shared her scary health challenges don't end there. In fact, two decades ago, she experienced a stroke at just 17 years old. "I just got my first record deal, and I had a stroke," she told The Guardian in an interview published Nov. 29.