Carrie Underwood Sings Happy Birthday After Inhaling Helium

It's no secret that Carrie Underwood has a killer voice, but have you ever heard someone sound this good while singing after inhaling helium?

Carrie sang Happy Birthday to her oldest son, Isaiah, the other day after sucking helium out of a balloon. Isaiah absolutely loved it and couldn't wait to make his voice high pitched like his mothers.

Watch the video her husband, Mike Fisher, caught below!

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