The news came along with an announcement for the dates of the singer's upcoming Cry Pretty tour, which kicks off on May 1, 2019.
Carrie Underwood says her family is adding "another fish to our pond".
Carrie Underwood caught fans off guard with an exciting announcement on Tuesday.
The Cry Pretty Tour 360 will stop in Kentucky at the KFC Yum!
Underwood and Fisher, who are already parents to three-year-old son Isaiah, were bombarded with congratulatory messages after the news spread online. "We will see you on the road in 2019!"
Under her tour schedule, she will perform on June 13 in the Giant Center in Hershey. Regular tickets sales start Friday, Aug. 17 at 10 a.m. MDT.
Underwood's next album, "Cry Pretty", is due out September 14. At the end of 2017, she suffered a awful fall outside her home, leaving her with a broken wrist and 40-50 stitches in her face.
"I'm 35, so we may have missed our chance to have a big family".
'We always talk about adoption and about doing it when our child or children are a little older'. "We are bringing along friends Maddie and Tae and Runaway June", she said, adding that "It's going to be absolutely awesome".