“Isaiah’s first band rehearsal … as you can see he and his daddy were totally into it!” the country star, 32, captioned a Saturday photo of husband Mike Fisher with their son, who was sporting a pair of oversized blue headphones — presumably for the noise.
They looked like they were working: Both boys are sound asleep in the pic.
Underwood, who gave birth in February, was preparing for Wednesday’s CMT Music Awards performance, her first since welcoming her son. Pregnancy is “such a miracle and such a beautiful thing,” she told PEOPLE days before her son’s arrival.
Soon after, Fisher, 34, added, “We’re definitely blessed to have him join us in our lives. There’s no better feeling.”
— Adam Carlson