Celine Dion shocked fans last year when she revealed that she would have to postpone her forthcoming tour after suffering a health setback.

The Canadian singer was due to play two dates in Dublin in March, and said that she was suffering from muscle spasms that were preventing her from performing. It was later revealed that she had been diagnosed with 'stiff person syndrome' - a rare autoimmune neurological condition that causes muscle stiffness and spasms that can come and go. There is no cure for the condition.

Dion has made the odd public appearance, including a brief performance at an NHL game in Las Vegas last month, but her sister Claudette has revealed more about her condition in a new interview, saying that she was 'working hard' to overcome the debilitating diagnosis.

"She's working hard, but she doesn't have control over her muscles," she said. "What breaks my heart is that she's always been disciplined. She's always worked hard. Our mother always told her, 'You're going to do it well, you're going to do it properly.'"

She added: "It's true that in both our dreams and in hers, the goal is to return to the stage. In what capacity? I don't know."

The 55-year-old Dion released a statement postponing her 'Courage' tour last year that read: "It hurts me to tell you that I won't be ready to restart my tour in Europe in February. I miss seeing all of you…being on stage...performing for you. I always give 100% when I do my shows, but I can't give you that right now. For me to reach you again, I have no choice but to concentrate on my health, and I have hope that I’m on the road to recovery."

Get well soon, Celine!