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JOHN KRASINSKI has been the charming and painfully relatable co-worker on NBC's "The Office" for 8 hilarious seasons. Today he's here to tell Ellen about his new film, "Big Miracle," based on the incredible real-life whale rescue story. Plus, a dynamic two-person musical group, 2CELLOS will give an electric performance of the Guns N' Roses classic, "Welcome to the Jungle." See them here today before you watch them tomorrow on "Glee"!