Cyrus shared her candid reflection as part of her TikTok docu-series Used To Be Young, with the series covering the milestone moments of her life from her early days as Hannah Montanna up until the present day.
During the series, the singer also reflected on the early days of her relationship with Hemsworth and the story behind their first meeting.
"In 2008, I needed to do another feature film for Disney and I didn't want it to be a part of Hannah Montanna. Once we had written the screenplay [for The Last Song], it was time to audition all the guys who would play Will, my boyfriend, in the movie and we had gotten it down from thousands to the final three, and Liam was a part of that final three."
With the duo officially cast in the leading roles in Nicholas Sparks' first teen love story, Cyrus and Hemsworth's on-screen romance continued to blossom outside of the film's production, with the couple debuting their relationship at The Last Song's premiere in March 2010.
"I think one of the elements that made that movie feel so special was that it was watching two very young people fall in love with each other, which was happening in real-time and in real life," said Cyrus.
"The chemistry was undeniable, and that was the beginning of a long 10-year relationship."