Recurring Guest Characters Blake Shelton 2 guest appearances Céline Dion 1 guest appearances Tori Kelly 1 guest appearances Jay Leno 1 guest appearances William Shatner 1 guest appearances Barbra Streisand 1 guest appearances Ariana Grande 1 guest appearances Rod Stewart 1 guest appearances Carly Rae Jepsen 1 guest appearances Justin Bieber 1 guest appearances Kellie Pickler 1 guest appearances Ed Helms 1 guest appearances