Harvick announced DeLana Harvick's pregnancy during a media event at Richard Childress Racing.
The couple closed their race team at the end of last season and said they were excited to use all the free time they were about to acquire.
But they also weathered persistent rumors they were closing Kevin Harvick Inc. because they were splitting up and selling off the assets to prepare for a divorce. Both repeatedly dismissed the comments.
The Harvicks join a growing baby boom in the NASCAR garage. Matt Kenseth, Carl Edwards, Jeff Gordon, Elliott Sadler, Jimmie Johnson and Jamie McMurray are among the drivers with young children.