Bruno Mars will show off his doo-wops and hooligans on The Voice when he performs on the Season 3 finale on Dec. 18, 2012. Today, NBC announced that the hit recording artist is a part of the live finale’s all-star lineup, including Rihanna, The Killers, and Kelly Clarkson. Bruno Mars will debut "When I Was Your Man" from his new album Unorthodox Jukebox. Are you looking forward to his performance? Weigh in below!