The Parrs Wood High School Choir joined the US popstar for a performance of the title track from her second album.
One of the choir members started the song before Grande joined them.
She took the child’s hand, and the latter was then seen becoming incredibly emotional as her idol held her tight.
It had viewers up and down the country in tears, as well as the gathered audience.
Grande organised tonight’s concert after a crazed suicide bomber detonated a device outside her show at Manchester Arena 13 days ago.
The blast left 22 dead and many more injured.
The choir told This Morning this week: “We want to do as much as we can for everyone who was a victim.”
Some of them were at the show on that fateful night last month.
One member recalled: “We’re really, really excited to perform with Ariana Grande, but we also know that we need to raise funds for those people who were injured and who passed away, because it’s just devastating and it’s awful.”
Take That, Robbie Williams, Miley Cyrus and Pharrell Williams were also on the bill tonight.