Kelly Clarkson jokingly called Blake Shelton out for not knowing a song two contestants performed on The Voice. Although Kelly and Blake mess with each other a lot on the show, they're still close friends. Kelly recently divorced her husband, Brandon Blackstock, who was also Blake's longtime music manager. This didn't stand in the way of Kelly and Blake's friendship, however. The two still have a relationship that they put above their business ties.
Kelly isn't the only coach to mess with Blake
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