Carrie Underwood shares photos of her son Jacob for his 1st birthday: 'You are truly our miracle baby'

Carrie Underwood is celebrating the first birthday of her son, Jacob.

The superstar singer, 36, shared a heartfelt note to her child on Instagram on Tuesday, describing what she loves about him.

She also shared photos of his beautiful cake, adorned with a baby figurine on top wrapped in a green blanket.

"Happy birthday, Jacob! How are you already 1 year old?" Underwood wrote alongside a gallery of photos of the 1-year-old shoveling the cake into his mouth. "You are smiley, crazy, smart, soooo fast and into everything!"

"I can’t wait to see your personality continue to shine!" she added.

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"I have a good feeling you’re going to keep us all on our toes for years to come!" she continued. "I thank God for you each and every day. You are truly our miracle baby!!! Mommy loves you!"

Jacob is the younger sibling to Carrie and husband Mike Fisher's eldest son, 4-year-old Isaiah.