The child will be Underwood's second with husband and professional hockey player Mike Fisher, joining son Isaiah, who was born in 2015.
The 35-year-old country superstar announced she was pregnant on Wednesday with a sweet Instagram post, and the source says Underwood has been anxious to share the big news. "We're just so excited that you guys can share this with us and be a part of this with us".
"You might be wondering and asking, 'Carrie, why is your tour starting in May?'" she teases.
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Underwood will be joined on tour by special guests Maddie & Tae and Runaway June.
Bizarrely, the happy news comes just days after the singer lamented that she's left it too late to fulfill her dream of having more children.
Tickets for Underwood's upcoming tour go on sale starting August 17 at 10 a.m. Passes to the Wells Fargo Center date will be available through the venue's website and box office, as well as by phone at 1-800-298-4200. Her Sacramento stop is scheduled for May 19 2019. At the end of 2017, she suffered a bad fall outside her home, leaving her with a broken wrist and 40-50 stitches in her face. "We always talk about adoption and doing it when our child or children are a little older", Underwood said. "We are bringing along friends Maddie and Tae and Runaway June", she said, adding that "It's going to be absolutely wonderful".