The US version of The Voice has premiered its trailer online to promote season seven. The video features new judge Gwen Stefani in the clips alongside fellow judges Pharrell Williams, Adam Levine and Blake Shelton. Stefani’s hit single “Hollaback Girl” can be heard playing while the judges interact. Now on its seventh season, Pharrell Williams joined the show as a judge in March 2014. Levine and Shelton have been judges on the series since it began in the US. The new show will air on NBC on the 22nd of September 2014.