(USA TODAY) -- "Life is beautiful," tweeted Miley Cyrus early Wednesday morning.

And now we know why.

The 19-year-old singer/actress and The Hunger Games star Liam Hemsworth, 22, who met in 2009 on the set of The Last Song, are engaged to be married after three years of dating, reports

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Hemsworth popped the question with a 3.5-carat Neil Lane diamond.

"I'm so happy to be engaged and look forward to a life of happiness with Liam," Cyrus told People.

Cyrus is in the studio working on a new album, while Hemsworth is filming Empire State in New Orleans.

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