Miley Cyrus isn't just about partying on her new album, due out this fall.

While 'We Can't Stop' celebrates all nighters, the new song 'The Last Goodbye' is about a much more serious topic, one that is close to her heart. And no, it does not pertain to fiancé Liam Hemsworth.

It's actually about her beloved pooch Lila, who died in December of last year. A five-second snippet -- and it's generous to call it that, since it's so short -- of the song has landed online.

A source close to the singer and actress told Hollywood Life that the song is about Miley's late dog. "It isn’t about Liam," the insider said. "It’s actually something that came to her after her dog died and formed into this song. It started as a sad song but when it’s released you’ll see that it is actually uplifting."

So Lila is immortalized in song. That's love! It's clear that Cyrus adores her pooches, posting tons of photos on Twitter. So it's not shocking that she would celebrate her fur baby via song.

The song snippet doesn't give us much to go on, but hey, have a listen anyway.

Listen to a Snippet of Miley Cyrus, 'The Last Goodbye'