Carrie Underwood Celebrates Son Isaiah's 6th Birthday With Sweet Tribute

Carrie Underwood’s baby boy is growing up!

The American Idol alum celebrated her son Isaiah Michael Fischer’s birthday this Saturday (February 27) with a sweet message for her little man. Isaiah, who turned 6 years old this weekend, was treated to a delicious Power Rangers-themed birthday cake on his special day, as well as a loving tribute from his proud mommy.

“Today, we celebrate Isaiah...because today, he is 6 whole years old! Isaiah, you are kind, funny, smart, the best big brother, a lover of cuddles and crafts and you have the biggest heart and the best imagination!” Underwood wrote in her message along with a black-and-white snapshot of her hugging her baby boy.

“You love to make people feel good and you especially love to make them laugh!” the 37-year-old continued. “God has given you so many gifts and every day, I thank Him that I get to be your mom! I love you, Monkey! ❤️❤️❤️ Happy birthday! And thank you, @iveycakestore for this epic Power Rangers cake!!! Yum!!!”

Isaiah is Underwood’s firstborn child with husband Mike Fisher, with whom the “Before He Cheats” star shares 2-year-old son Jacob.

In December 2020, Underwood and Isaiah performed “Little Drummer Boy” on the superstar’s Christmas album, My Gift.

Speaking of the precious bonding moment, Underwood told PEOPLE, "When I first heard it back I was laughing and crying at the same time because it was just this beautiful, pure moment from him. He did such a great job. He remembered the lyrics and he sang it with his whole heart."

Photo: Instagram/Carrie Underwood