"I want to thank you so much for coming together and being strong", Grande told the crowd.
Manchester Evening News In this photo taken on Friday, June 2, 2017 provided by the Manchester Evening News, victim of the Manchester concert blast Lily Harrison hugs singer Ariana Grande during her vistit to the Royal Manchester Children's Hospital, in Manchester, England.
Many took to the Internet to speculate whether Grande and boyfriend Mac Miller - who performed with her during the empowering One Love Manchester show - were engaged after spotting the starlet wearing a diamond ring on her left hand. Twenty-two people were killed and dozens more were injured.
The Good Morning Britain co-host had originally criticized Grande for leaving the United Kingdom soon after the suicide bombing at her May 22 Manchester concert instead of staying behind to be with the surviving victims and their families.
Ariana Grande paid tribute to the city of Manchester, England, on Sunday with an energetic, all-star concert that raised millions for victims of a suicide bombing that tore through her last performance in the city almost two weeks ago.
Justin Bieber, who shares a manager with Grande, prefaced his acoustic performance of "Cold Water" by asking the crowd to chant "Love".
But Arianna's duet act with the young choristers of Parrs Wood High School of Manchester stood out as one of the most powerful moments of the concert.
Oasis" "Don't Look Back In Anger" - which has become a poster song for the solidarity of Manchester following the terror attacks - has climbed to eighth in the charts whilst Coldplay's "Fix You" and Oasis' "Live Forever' reached ninth and eleventh in the chart.
One Love Manchester eventually came to a close with Ariana Grande singing Somewhere Over the Rainbow, and leaving the 50,000 attendees and hundreds of viewers in floods of tears.
Our thoughts are with all of those affected by the Manchester terror attack.
The One Love Manchester concert aired across the globe.