According to The Hollywood Reporter, pop superstar Christina Aguilera will return for season 2 of NBC's hit singing competition show "The Voice."  Despite speculation as to whether she would come back for another go, a source, THR claims, says she signed on weeks ago.  Aguilera reportedly earns $225,000 per episode for her role, while fellow coaches Adam Levine, Cee Lo Green, and Blake Shelton earn $75,000 per episode.  Season 2 is scheduled to begin in February right after the Super Bowl, assuming the NFL and Players Association reach an agreement to keep the season intact.  Levine, THR says, has also agreed to come back.