Carrie Underwood is expecting her first child, or at least that's what she implied on Twitter Monday.

In a tweet featuring the country music star holding her two small dogs, Underwood wrote this caption: "In honor of "Labor" Day...Ace & Penny would like to make an announcement. Their parents couldn't be happier!"

The dogs wore shirts reading, "I'm going to be a big brother," and "I'm going to be a big sister."

Underwood is married to Mike Fisher, who plays hockey for the Nashville Predators. The two have been married since 2010.