Carrie Underwood chose one her "Sound of Music" cast mates to be the star of her "Little Toy Guns" video.

The little girl's name is GRACE RUNDHAUG and she played Marta von Trapp when they did the musical live on NBC.

Carrie said, "Whenever I thought of the types of things I wanted to see in this video, I just saw her face."

The video is really intense, check it out here -

Theo Wargo, Getty Images