'The Voice' reveals season 9 coaches

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.

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