Country star Carrie Underwood, Mike Fisher welcome baby boy

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Country music star Carrie Underwood and her husband, Mike Fisher, welcomed a new baby boy early Monday, their second child together.

In a social media post on Twitter Wednesday showing a picture of Fisher holding his new son, Underwood said the baby's "mom, dad and big brother couldn't be happier."

“Our hearts are full, our eyes are tired and our lives are forever changed. Life is good…,” she wrote.

The couple already has a 3-year-old son named Isaiah.