Emily Blunt Slays ‘Piece of My Heart’ on ‘Lip Sync Battle’ [FULL VIDEO]Emily Blunt Slays ‘Piece of My Heart’ on ‘Lip Sync Battle’ [FULL VIDEO]Emily Blunt channeled her inner Janis Joplin during the April 9 episode of Lip Sync Battle, absolutely slaying her performance of "Piece of My Heart."Michelle McGahanMichelle McGahan