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Sia Furler, the songwriter who performed on David Guetta's hit "Titanium," is engaged.

Her mother has confirmed to Adelaide, Australia's The Advertiser that Sia is engaged to documentary filmmaker Erik Anders Lang. He previously hinted at the good news last week on Instagram, when he posted a photo of a woman's hand wearing an engagement ring.

Sia, who hails from Adelaide, has also written hit songs for the likes of Rihanna, Britney Spears, Celine Dion and Beyoncé.

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