Keira Knightley demonstrates her singing skills in the upcoming movie Begin Again, listen to the track Lost Stars here!

Knightley stars in Once director John Carney's film as Greta, who moves to New York with her college sweetheart Dave (Adam Levine) to try and break into the music industry.

Check out the song Lost Stars from the Begin Again soundtrack below.

And click the video link above to watch Ten's Harry Guerin talk to Keira about the film.