Pop music and 'Grease' star Olivia Newton-John dead at age 73

Olivia Newton-John rides in the 85th annual Hollywood Christmas Parade in Los Angeles, California, U.S. November 27, 2016. REUTERS/Phil McCarten/Files

Singer Olivia Newton-John, who soared to the top of the world's pop music charts in the 1970s and 1980s with such tunes as "I Honestly Love You" and "Physical" and starred in the hit movie musical "Grease," died on Monday at age 73 at her home in Southern California.

The death of the British-born, Australian-raised performer was announced on her Instagram account, saying she "passed away peacefully" at her ranch home "surrounded by family and friends."