Olivia Newton-John, a singer and actress who achieved international acclaim, has died at the age of 73.

A rep for Olivia—best known for co-starring alongside John Travolta in the 1978 cult classic “Grease”—told TMZ she passed away peacefully early Monday morning (Aug. 8) at her Southern California ranch as she was surrounded by family and close friends.

Olivia had been battling breast cancer for over 30 years, however, her rep did not disclose her official cause of death.

As a singer, she was known for her biggest hit “Physical,” which was released in 1981 and remained #1 for 10 weeks. Her other hit singles included songs like “If Not for You” (1971), “Let Me Be There” (1973) and “Have You Never Been Mellow” (1975).

Her big break came in 1978 when she starred in “Grease” alongside John Travolta. Her role as Sandy was iconic, as were several songs from the film, including “You’re the One that I Want,” “Summer Nights,” and “Hopelessly Devoted to You.”

Olivia Newton-John leaves behind her husband, John Easterling, and a 36-year-old daughter, Chloe Lattanzi, from a previous relationship.

Be the first to receive breaking news alerts and more stories like this by subscribing to our mailing list.