Australian singer, actor and activist Helen Reddy has died, aged 78.

“It is with deep sadness that we announce the passing of our beloved mother,” her children Traci and Jordan posted on Facebook.

“She was a wonderful mother, grandmother and a truly formidable woman.

“Our hearts are broken. But we take comfort in the knowledge that her voice will live on forever.”

Reddy, who was best known for her song I Am Woman, the unofficial anthem of the feminist movement in the 1970s, died in Los Angeles on Tuesday.

She had been diagnosed with dementia in 2015.

Hundreds of Reddy’s fans from around the world have begun flooding her official fan page on the Facebook platform, praising her achievements and mourning her passing.

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“Quiet Please, There is a Lady Leaving the Stage,” the page administrator posted.

Reddy was born on October 25, 1941, in Melbourne, Victoria.