All together now: What, again?! Blonde songstress Christina Aguilera is returning to The Voice for Season 8, rejoining mainstays Adam Levine and Blake Shelton and newbie Pharrell Williams on the coaching panel. She'll replace Gwen Stefani, who replaced Shakira, who had replaced...Aguilera. Christina welcomed her second child, daughter Summer Rain Rutler, in August. Aguilera was one of the hit show's original coaches, alongside Shelton, Levine and Cee Lo Green. She last occupied her swiveling red chair on the show's fifth season.