The American Idol winner wore her long blonde hair in plaits, as she performed at the popular CMA Music Fest in Nashville.
The annual event continued as normal, despite heavy flooding causing $2 billion of damage to the area just last month.
'I think everybody is really conscious about the flood relief and stuff like that that's going on,' Carrie said. 'There's a lot of charity events this week for flood relief.
'It's just really cool, too, the show must go on, to get out and do our thing.'
Underwood performed on Music Fest's opening night at LP Field, one of the many structures that suffered extensive flood damage.
There will be concerts there every night through the festival's closing on Sunday.
