VIDEO : Exclusive Interview: Joe Manganiello and Demi Lovato reveal their road to stardom

The latest installment in the long line of 'Smurfs' stories follows the lovably little people on an exciting race through a forbidden forest leading to the discovery of the biggest secret of Smurf history. Demi Lovato and Joe Manganiello lent their voices to the animated characters and learned exactly why they're so loveable.