The countdown to Sia's new album 'This is Acting' is on.

It'll be the Australian star's first album since her massive breakthrough with '1000 Forms of Fear', which spawned megahit 'Chandelier', and is out on January 15th.

So far, we've heard 'Bird Set Free' and 'Alive', and now she's unveiled another track from the album - which was allegedly turned down by Rihanna, no less.

Hear 'Cheap Thrills' below: