Olivia Newton-John, the top female pop singer of the 1970s who featured in films including "Oil" and "Xanadu," passed on Monday. She was 73.

A cause of death was not given, but she was diagnosed with breast cancer.

“Olivia has been a symbol of triumphs and hope for over 30 years sharing her journey with breast cancer,” her husband John Easterling wrote.

Newton-John was already a popular singer by the late 1970s. But her co-starring role in 1978's "Grease lifted her to a new level of stardom.

Newton-John and Easterling started dating in 2007, 15 years after their first meeting and secretly tying the knot in Peru on June 21, 2008

1973, when "Let Me Be There" became a top-10 hit on both the adult contemporary and the country charts then she became famous in US

In 1981, she took her new, sexier persona a step further with "Physical," it became her biggest hit, spending 10 weeks atop the Billboard Hot 100.

In her long career Newton-John won four Grammy Awards and sold more than 100 million albums