Private Girl


 * "It's so rock and roll to be alone" — Amy Macdonald

"Private Girl" is a song that was written and originally performed as a demo by Australian singer and songwriter Sia.

Background
"Private Girl" was featured in the 2018 film Vox Lux. The song is performed by actress Natalie Portman in her role as a pop singer and contains Sia's backing vocals.

Trivia

 * A snippet of the demo has been leaked, containing only a small part of the song.
 * One YouTube user isolated Sia's backing vocals, and they can clearly be heard in many parts of the song.