We all know that it is the coaches that do most of the ass kicking on "The Voice" to make the absolute best teams. But don't forget that they do have assistance for the Battle Rounds. For season eight, Team Pharrell Williams will have Lionel Richie; Team Adam Levine will have Ellie Goulding; Team Blake Shelton will have Meghan Trainor and Team Christina Aguilera will have Nick Jonas. This has not been officially confirmed, rumored by US Weekly , but if true, this will be Richie's second season as a mentor. The show returns Monday February 23rd on NBC. You won't want to miss it. No word on who will be the key mentor. So far, they have brought in Chris Martin from Coldplay and Taylor Swift !