“Tour bus life,” the What About Us hitmaker, 37, captioned the image of the sweet sibs joining their famous mama on the road.
The proud nursing mama recently shared a breast pump selfie.
“And now this #pumpupthejams#mombreak,” she wrote.
The singer’s husband, former motocross racer Carey Hart, Instagrammed an image of their daughter in London, England.
“Sunset with kid # 1,” he wrote.
Last week, the Who Knew hitmaker posted a photo playing with her baby boy on the floor.
Last month, the Just Like Fire singer posted a photo of her husband and their baby boy biking together.
In June, the Try singer shared a breastfeeding selfie with her son.
The Family Portrait singer and Hart welcomed their second child – full name Jameson Moon Hart – on Dec. 26, 2016.
Continue looking through our gallery to see more Hart family photos…