The 38-year-old 'My Love' singer showed off her diamond engagement ring and also wore a simple gold ring on the same finger. Her fiance was also spotted wearing the similar simple gold ring, reported Ace Showbiz.
The newly-engaged couple were attending Wayuu Taya gala at SoHo, New York. Wayuu Taya is a not-for-profit foundation, which helps a Latin community in the US.
Sia's mother, Loene Furler, confirmed the engagement and said that the couple would get married soon. Just last month, Sia revealed that she contemplated suicide after suffering from depression and getting addicted to drugs and alcohol.
In the same year, Sia wished to marry her musician girlfriend, JD Sampson, but later the couple split. The bisexual singer was reportedly not in any relationship recently before she got engaged to Erik.
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The Australian singer became addicted to alcohol and suffered from depression after her boyfriend died in an accident when she was about to meet him in London.
For that reason, she got close with 'Glee' star Lea Michele whose boyfriend Cory Monteith died of alcohol and heroin overdose.