"Some mornings, pants are optional...even when the fedora is not. Just kidding, we had a blowout. #KeepingItReal #momlife," she captioned a sweet photo of baby Isaiah wearing a Sesame Street themed diaper.
Underwood, who is currently on tour, and her husband, 36-year-old hockey star Mike Fisher, have been finding plenty of time to have fun in the sun during her busy schedule. The proud dad shared a sweet video of Isaiah last month belly flopping into a kiddie pool.