The country star announced the news via an Instagram video on Wednesday.
Carrie Underwood has major plans in store for 2019.
The singer announced this morning she will be singing at the Wells Fargo Arena in Des Moines on October 26, 2019, as part of her Cry Pretty Tour 360.
"Mike and Isaiah and I are absolutely over the moon and excited to be adding another little fish to our pond", Underwood said.
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Pitt was later provided with cell phone numbers for each child, in order to text and call them without Jolie's supervision. The documents acknowledge that the duo had an "informal arrangement", but that Pitt has not lived up to that agreement.
"You might be wondering and asking, 'Carrie, why is your tour starting in May?'" she teases.
The country music songstress also confided that she and her National Hockey League star husband had considered alternative options for growing their brood. "This has been a dream come true with the album and baby news and all that stuff".
The seven-time Grammy Award victor will release a new album, "Cry Pretty", on September 14.
The new baby will join older brother Isaiah (3), making the Fisher's a family of four.
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Police arrived just minutes later and brought the baby onto the pedestrian walkway where they continued CPR until EMS responded. Chiropractor Monte Campbell said his wife, Diana Campbell, first noticed the baby.
The American Idol victor recently discussed the possibility of expanding her family in an interview with Redbook.
"I'm 35, so we may have missed our chance to have a big family", Underwood told Redbook magazine.
'We always talk about adoption and about doing it when our child or children are a little older'.
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Adding to that, DC Comics describes her as having "self-destructive tendencies when it comes to personal relationships". Arrow " in 2014 and the last multi-show storyline " Crisis on Earth-X" premiered a year ago .