Carrie Underwood is one proud mom!
One of the buzziest moments on the powerhouse singer's Christmas album, "My Gift," is an appearance by her and husband Mike Fisher's 5-year-old son, Isaiah, on "Little Drummer Boy."
MORE: Carrie Underwood reveals her family's Christmas traditions"It was so great. When we recorded, I was able to be in the booth with him and encourage him and try to remind him what words were coming up next, things like that," Underwood recently told People of the experience.
The singer said tears began to flow after hearing her son sing "little baby/pa rum pa pum pum/I am a poor boy too/pa rum pa pum pum."
"I got to listen to his vocals [get] put together and then listening to myself with him, I was laughing, and I was crying, and it was just very overwhelming in a good way," she said. "It's just very emotional."
She previously described the "special experience" recording the duet in an interview with "Good Morning America."
"We didn’t know how it would go and tried not to put any pressure on him and knew that no matter what, it would still be a fun, special experience for us," she said. "He really performed from his heart and that comes across on the record."
MORE: Carrie Underwood on why she almost didn't follow through with 'American Idol': 'It was just too much'You can see a behind-the-scenes look at mother and son recording the song in the Grammy winner's HBO Max special, "My Gift: A Christmas Special from Carrie Underwood," streaming now.
Underwood will also star in an upcoming holiday feature, "Cracker Barrel Sounds of the Season," in which she will perform songs from "My Gift."
The feature will premiere on Cracker Barrel's YouTube and Facebook pages on Wednesday, Dec. 16 at 8 p.m. ET/7 p.m. CT.