On Friday night, the 23-year-old singer visited the Royal Manchester Children's Hospital, where many of her young fans are being treated, reported Entertainment Weekly.
Adam Harrison and Lauren Thorpe, who were injured in the blast, shared photos of their 8-year-old daughter Lily embracing Grande.
"All we can do is thank Ariana," Thorpe told People magazine.
"What Ariana Grande did tonight was so selfless and amazing... Lily looked on cloud nine," added Harrison.
The concert will take place June 4 at Manchester's Old Trafford stadium.