The couple, who met on the set of the 2010 film The Last Song, called off their engagement in 2013.
They became engaged in 2012, but broke up the following year. In April 2015 they rekindled their romance, and Cyrus has since been spotted wearing her gold Neil Lane engagement ring, though the couple have yet to officially confirm they are engaged again.
Hemsworth, 26, recently spoke out about their past split in an interview with GQ Australia.
"Of course it was hard, man," he said. "But we were both going in different directions and it's just what needed to happen. We were both super young and it was a good decision at the time — we both needed that."
The pair have also made their relationship “Instagram official,” with both posting photos of each other on their accounts.