03/03/2015 12:14 EST | Updated 05/03/2015 05:59 EDT

Carrie Underwood tweets baby news after giving birth to a boy

NEW YORK, N.Y. - Carrie Underwood is a new mom, and like all proud parents, she's showing him off in a photo.

The multiplatinum country singer gave birth to Isaiah Michael Fisher on Friday, and on Tuesday, she announced it to the world on Twitter. She posted a picture of Isaiah, showing his tiny hand and a bit of his mouth.

He's the first child for Underwood, 31, and her husband, Mike Fisher, who plays for the National Hockey League's Nashville Predators.