'The Little Mermaid': Behind-the-Scenes Look at Melissa McCarthy Singing as Ursula (Exclusive)

In ET's exclusive clip from the making of 'The Little Mermaid,' go behind the scenes as Melissa McCarthy sings Ursula's song, 'Poor Unfortunate Souls.' 'The Little Mermaid' is available for digital purchase now, and on Blu-ray Sept. 19.