Music Star Olivia Newton-John has had to face cancer before. Now she's helping her sister cope with the disease.

According to the Associated Press, Newton-John is postponing shows in Las Vegas.

(AP) - Olivia Newton-John is postponing her shows in Las Vegas to help take care of her sister.

Newton-John says her sister Rona has been diagnosed with brain cancer and she wants to spend time with her sister. Newton-John is a breast cancer survivor herself.

She was supposed to play a series of dates in Las Vegas this summer.