The Voice 'The Voice's Adam Levine "plays a dickhead very well," says movie co-star Keira Knightley 06/10/2014 Adam Levine, who serves as a coach on The Voice, is apparently great at being a jerk. Read More RELATED NEWS Christina Grimmie's family reaches out after Las Vegas shootingChristina Grimmie's family sues concert promoter and Orlando venue over her deathUsher gets star on the Hollywood Walk of Fame TAGS: The Voice Adam Levine Keira Knightley