Carrie Underwood is a mommy!

The 31-year-old "American Idol" winner and her hockey star husband Mike Fisher welcomed their first child together, a son named Isaiah Michael Fisher. The Oklahoma native made the announcement via social media on Tuesday.

"Tiny hands and tiny feet...God has blessed us with an amazing gift! Isaiah Michael Fisher - born February 27," the country star tweeted, along with a photo of her newborn son's adorable hand.

The couple, who tied the knot in 2010, revealed they were expecting in September after Underwood posted a photo of her two dogs wearing shirts that said they were going to be a big brother and big sister to a new baby.

The singer captioned the photo, "In honor of "Labor" Day...Ace & Penny would like to make an announcement. Their parents couldn't be happier!"

As for the couple's name selection, Underwood told E! News in December, "We'll start throwing things out but it's difficult. I think we'll know when we know. It might even take meeting the little guy before we actually decide on something."