Carrie Underwood Sings ‘Heartbeat’ with Son, Isaiah

It sounds like Carrie Underwood and Mike Fisher have a little singer on their hands!

In an adorable clip posted to Instagram, 18-month-old Isaiah can be heard singing “Heartbeat” along with his superstar mom. As Underwood sings lines to her chart-topping single, Isaiah completes them, showing off his adorable little pipes. If you listen closely, it sounds like Underwood is holding back laughs during the pauses.

“Audio only…my sweet boy singing his little heart out. This is the most beautiful sound in the world,” the “Dirty Laundry” singer wrote in the caption.

The singer is currently in the midst of the second leg of her wildly successful Storyteller tour, which recently brought her to San Jose, Seattle, and Boise.

In addition to taking her show on the road through the rest of the fall season, the Oklahoma native is also preparing to host the 50th Annual CMA Awards for the ninth consecutive time alongside Brad Paisley. Underwood is nominated for for four CMA Awards, including the night’s top honor, Entertainer of the Year.

The 50th Annual CMA Awards will air live from the Bridgestone Arena in Nashville, Wednesday, Nov. 2 (8:00-11:00 PM/ET) on the ABC Television Network.