The Grammy-winning superstar Olivia Newton-John, who reigned on pop, country, adult contemporary and dance charts, won countless hearts as everyone’s favorite Sandy in the blockbuster film version of “Grease,” has died at the age of 73.

Newton-John, a longtime resident of Australia whose sales topped 100 million records, died on Monday at her Southern California ranc. Her husband John Easterling, wrote on Instagram and Facebook, reports AP.

From 1973-83, Newton-John was among the world’s most popular entertainers. She had 14 top 10 singles just in the U.S., won four Grammys, starred with John Travolta in “Grease” and with Gene Kelly in “Xanadu.”