Gwen Stefani brings on the heat in the super colorful visual for her brand-new single "Spark The Fire". The fun and playful song was produced by singer/superproducer Pharrell Williams who also lends his vocals on the track. The Sophie Muller-directed music video finds Gwen Stefani floating on a cloud in an emoji world with Pharrell's head cutouts circling around her. The clip also shows Gwen dancing in an underground club, inciting people to put up their lighters and "spark the fire". She's later joined by her collaborator holding a sparkler and a crowd with glow sticks.