'The Voice's Christina Aguilera, Adam Levine, Cee Lo Green and Blake Shelton rock House of Blues

Slideshow posted in Photos | Friday, November 09, 2012

6 of 14: 'The Voice' contestants Amanda Brown ('Team Adam') and Sylvia Yacoub ('Team Christina') walk the red carpet before the NBC show's special concert to celebrate the announcement of the top 12, held at the House of Blues in Los Angeles on Nov. 8, 2012. ( Photo / Frazer Harrison / NBC)