Carrie Underwood Reveals Duet With Son Isaiah

(Radio.com) Carrie Underwood shared audio of her son Isaiah singing along to her 2015 single "Heartbeat," off her album Storyteller, and the 18-month-old seems like he's inherited his mom's vocal power.

Underwood shared the video on Instagram Sunday (September 11), which only featured audio. In it, Underwood can be heard prompting Isaiah with lines from the song.

He mimics her voice in places, and in others does his own thing, but he's got some serious power to those lungs. "Audio only�my sweet boy singing his little heart out," she wrote. "This is the most beautiful sound in the world!" Check it out here.

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