Blake Shelton + Gwen Stefani Drop in at ‘The Voice’ Alum Jay Allen’s Oklahoma Ole Red Show [Pictures]Blake Shelton + Gwen Stefani Drop in at ‘The Voice’ Alum Jay Allen’s Oklahoma Ole Red Show [Pictures]"You can't plan moments like this," Allen said of the fun surprise from his former 'The Voice' mentors.Carena LiptakCarena Liptak