Demi Lovato is previewing her forthcoming new single, “Heart By Heart.”

The singer has released a 60-second snippet of the tune, which will be featured on the soundtrack to “The Mortal Instruments: City Of Bones” film, due in theaters August 21.

The soundtrack also features contributions from Jessie J., Zedd, AFI, Colbie Caillat and more.

Based on the best-selling novel by Cassandra Clare, the film is about a Brooklyn teen Clary Fray (played by Lily Collins) who learns that she is a member of a race of demon destroyers known as Shadowhunters. The movie also stars Jamie Campbell Bower, Jonathan Rhys Meyers, Lena Headey, Kevin Zegers and Godfrey Gao.


Demi Lovato






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