Carrie Underwood Announces She's Pregnant

— -- Puppies, babies -- Labor Day couldn't get any cuter for country star Carrie Underwood.

The "American Idol" alum, 31, revealed she's having a baby by posting a sweet picture with her dogs.

"In honor of "Labor" Day...Ace & Penny would like to make an announcement. Their parents couldn't be happier!" she wrote.

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The picture features her two dogs wearing shirts, saying they are going to be a big brother and big sister to a new baby.

This is the first child for Underwood, who married hockey star Mike Fisher in 2010.