Carrie Underwood, husband Mike Fisher and son Isaiah are now a family of four. Underwood gave birth to her second child, a baby boy, on Monday (Jan. 21). The country star shared the happy news on Instagram on Wednesday (Jan. 23).

Jacob Bryan Fisher was born "in the wee hours of the morning on Monday," Underwood's instagram post shares. "His mom, dad and big brother couldn't be happier for God to trust them with taking care of this little miracle!

"Our hearts are full, our eyes our tired and our lives are forever changed," adds Underwood. "Life is good ..."

Underwood's baby announcement includes three photos of herself, Fisher and their son Isaiah with baby Jacob. The whole family is all smiles.

Underwood announced her second pregnancy in August, when she shared plans for her upcoming 2019 Cry Pretty Tour 360. In September, Underwood shared with fans that she had suffered three miscarriages over the course of the past year while she and Fisher tried to grow their family. Add to that her November 2017 fall outside her Nashville home, in which she broke her wrist and injured her face so severely that she required dozens of stitches, and the arrival of Baby No. 2 even more special.

Underwood and Fisher were married in July of 2010. Isaiah, their first child, arrived in 2015.

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