'The Voice' Reveals Season 9 Coaches

Trae Patton/NBC
Gwen Stefani, Adam Levine and Blake Shelton on "The Voice."

The Voice just announced the coaching lineup for season 9 of NBC's singing competition series: Adam Levine, Blake Shelton, Gwen Stefani and Pharrell Williams

This marks a return for Stefani, who sat out season 8 while Christina Aguilera returned. Now Aguilera is out, presumably because if two women are part of a reality show coaching gang at the same time, the whole world might implode.