The 19-year-old `Can`t Be Tamed` singer - who got engaged to the 22-year-old `The Hunger Games` actor last June - revealed he popped the question after she treated him to an intimate performance of one of his favorite songs `Look What They`ve Done to My Song` by Melanie Safka in their backyard.
Miley told `The Tonight Show With Jay Leno` on 12.10.12: "About twenty minutes after that song - that`s one of Liam`s favorite songs - he asked me to marry him, like, twenty minutes later so while I was singing that I had no idea and he`s sitting there and I`m like he`s looking at me funny and then I know."
Liam recently demonstrated his commitment to Miley by getting a similar tattoo as her from President Roosevelt`s famous `Citizenship in a Republic` speech made in 1910. The loved-up couple - who met on the set of `The Last Song` in 2010 - are in no rush to walk down the aisle.
`The Climb` singer said: "I`m really excited to obviously get married, but I kind of already feel married.
"I know we are forever. I don`t really need the paper right now."