The pop star paid a surprise visit to youngsters at the Royal Manchester Children's Hospital, who continue to be treated following the May 22 suicide bombing following her concert at the Manchester Arena.
Grande spoke with and hugged the children, and posed for photographs.
The singer spent some time talking to nurses:
She left some gifts:
And she also penned a heartfelt note to one of her fans:
She surprised those she couldn't visit with video chats:
Adam Harrison, whose daughter Lily sustained spinal injuries in the attack, said she was "on cloud nine" following Grande's visit.
"This means more to us than all the amazing things people have done this week," said Peter Mann, whose daughter Jaden was also injured in the blast.
"So happy she came I could burst. Never seen Jaden so happy; even cried again myself," Mann told the BBC.
Grande made the hospital visit soon after returning to Manchester for the first time since the May 22 attack, which killed 22 people and injured dozens more.
It came ahead of her all-star "One Love Manchester" benefit concert at the Emirates Old Trafford stadium in Greater Manchester on Sunday.