Underwood made the announcement with a video posted to her Instagram page on Wednesday morning, stating, "Mike and Isaiah and I are absolutely over the moon and excited to be adding another little fish to our pond".
Well, it turns out she has a very good reason for the delay - it's not easy to tour when you're several months pregnant or caring for a brand new baby!
"Ooh baby do we have a bundle of info to share with you!" The news comes after a Redbook interview in which the singer suggested more biological children might not be in her future. "This has just been a dream come true with album and baby news and all that stuff".
Country music superstar Carrie Underwood is coming back to Louisville - and that's not all.
NASA announces crew for commercial spaceships
SpaceX has also faced its own problems, particularly with its Falcon 9 rocket that will power the Dragon into space. It now looks like SpaceX will be the first to launch humans on its crew Dragon spacecraft, set for April 2019.
Underwood met former Nashville Predators player Fisher at one of her concerts in late 2008.
Underwood performed at the PPL Center in March 2016 and at the Allentown Fair in September 2015.
According to Underwood's website, tickets go on sale on August 17.
'We always talk about adoption and about doing it when our child or children are a little older'.