Demi Lovato's Unbroken Track Listing Reveals Missy Elliott, Jason Derulo Collabos

Timbaland and singers Dev and Iyaz will also appear on the 15-song set, which drops on September 20.

Iyaz Talks About 'Roller-Coaster Ride' Of Success That 'Replay' Has Brought Him

Sean Kingston-endorsed singer has a huge hit single.