Ariana was joined on stage by 26 students from the Parrs Wood High School choir to sing an emotional rendition of Grande's song My Everything and was visibly moved to tears while performing.
"I'll be returning to the incredibly fearless city of Manchester to spend time with my fans and to have a benefit concert in honor of and to raise money for the victims and their families", she added.
The 23-year-old pop star, who had to leave Manchester after the horrific attack at her May 22 concert here, made sure that her return filled the entire city with joy and happiness once again.
Around £10million has been raised so far following the concert, which was screened live on the BBC.
Rachel Jea, 32, said she was at Grande's previous Manchester concert and felt it was important to attend Sunday's show to regain trust after the bombing. She ended the concert by singing Somewhere Over The Rainbow.
Morgan criticised Grande after Katy Perry tweeted an image of Queen Elizabeth II visiting injured Millie Robson, 15, writing: "God bless The Queen and her kind heart".
In this Sunday, June 4, 2017, handout photo provided by Danny Lawson for One Love Manchester, singer Ariana Grande performs at the One Love Manchester tribute concert in Manchester, north western England, Sunday, June 4, 2017.
USA pop singer Ariana Grande headlined a star-studded benefit concert in Manchester on Sunday that was both joyful and mournful, in aid of victims of the bombing that rocked the city last month, as security fears ran high after attackers in London killed seven people.
The show opened to a minute of silence and a performance by Marcus Mumford of Mumford and Suns.
But the American singer's manager Scooter Braun said the Manchester gig now had a "greater purpose" than ever after the country's second terror attack in two weeks.
"Today's One Love Manchester benefit concert will not only continue, but will do so with greater goal", Braun said in a statement.
"I'm so honoured to be at this incredible event surrounded by all you awesome people".
Grande also ushered in artists like Little Mix and Imogen Heap, while Stevie Wonder was featured in a video segment where, while strumming his keyboard declared, "Love is truly the key, I don't care what ethnicity you are, what religion you are". "We love you so much, to the families we love you so much".
She had just left the stage May 22 when a suicide bomber detonated a nail bomb outside the arena as people were streaming out of the venue.
She said: "I had the pleasure of meeting Olivia's mummy a few days ago and I started to cry and gave her a big hug and she said 'stop crying, because Olivia wouldn't have wanted you to cry".