After battling breast cancer herself, singer Olivia Newton-John is coming to the aid of her older sister, who has been diagnosed with brain cancer.
The 64-year-old "Grease" star, who beat breast cancer 20 years ago, has postponed her upcoming Las Vegas show to be with her sister, Rona Newton-John, 69.
In a statement to Entertainment Tonight, Olivia Newton-John said she had recently received "the very sad news" that her sister had been "diagnosed with brain cancer."
"In light of this news, I have decided to postpone my forthcoming Las Vegas residency to spend time with her and our family," Newton-John wrote. "As a cancer 'thriver' myself, as many people are, I am very aware of the importance of love, support and family during this journey she is about to begin."
The Australian pop singer is postponing her gig at Vegas' Flamingo hotel substituting for Donny & Marie Osmond's away dates even before tickets go on sale, according to the Las Vegas Sun.
Her sister Rona was also an actress and was married to Newton-John's "Grease" co-star Jeff Conaway from 1980 to 1985. Their son, Emerson, 38, is a race-car driver.
Conaway, who famously struggled with substance abuse, appearing on "Celebrity Rehab with Dr. Drew," died in 2011 at age 60.