Sia has premiered a brand new track online, Digital Spy reveals.

The singer has teamed up with Greg Kurstin to write and produce new song 'Opportunity' for the upcoming remake of Annie.

Quvenzhané Wallis - who plays Annie in the big screen reboot - performs the song during a key scene in the new film.

"Annie sings this song after she realises that she's got a good thing going with Jamie Foxx's character," director Will Gluck told People.

"She goes to the Guggenheim Museum and they ask her to give a speech, but instead she just sings a song about what a great opportunity she's been given."

This new version includes vocals by both Wallis and Sia, and will be included on the accompanying soundtrack out on December 15.

Annie - which also stars Jamie Foxx and Cameron Diaz - will be in cinemas from December 19.