The comment was made during Wednesday's Australians in Film Awards 2012 event.
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During his acceptance speech after winning the 'Breakthrough Act Award', Hemsworth paid tribute to his breakthrough movie The Last Song, in which he starred with Cyrus.
He said: "I was fortunate enough to get called back in to read with my now-fiancée, who I recently got engaged to.
"And we read together and fell in love and now we're married."
He quickly revised: "Well, not married yet but we will be."
The couple announced their engagement earlier this month, and this was their first formal appearance as an engaged couple.
