It will air from 6.55pm BST to 10pm BST on Sunday June 4.
Proceeds from the show, which will broadcast live across the globe, will go to an emergency fund set up by the city of Manchester and the British Red Cross.
The attack at Manchester Arena following the singer's concert on May 22 left 22 people dead and dozens injured, many of them children who had come to see their favourite singer perform.
Grande has 107 million followers on Instagram, and she posted a photo of her visit to the Royal Manchester children's hospital on Friday.
Jaden's mother Sharon told the Manchester Evening News: "Jaden was just sat there watching TV and she walked in". He admitted to getting "goosebumps" when Ariana visited his daughter and told her, "I'm so proud of you".
"It was (a) tough realisation that we thought we may have lost her", he shared.
Around 130,000 are due to attend the benefit concert on Sunday which will feature performances from other stars including Justin Bieber, Katy Perry, Miley Cyrus and Coldplay. She quickly headed for a hospital in the northern English city where numerous injured are being treated. The event, dubbed "One Love Manchester", will take place at Emirates Old Trafford.
Ariana Grande visitou Hoje fãs que ainda estão no hospital por causa do atentado de Manchester! "She'd met Prince William earlier and then Ariana walked in".
Unfortunately, over 10,000 people who didn't attend the original concert are trying to get into the benefit for free.