Ariana Grande was moved to tears during a star-studded charity concert for the victims of the Manchester terror attack.
The US pop singer broke down several times during the three hour show frequently telling the audience "Manchester, I love you".
It was the first time she had returned to the city following the attack at the Manchester Arena where she performed the night 22 people, including an eight-year-old girl, lost their lives.
The choir of girls and boys provided backing vocals for 12-year-old soloist Natasha-Rose Seth as they performed the star's hit in front of 50,000 people.
Some of the children in the choir were at the fateful concert at Manchester Arena.
The singer said she had not planned to play so many of hits during the show but changed her mind after meeting the mother of Olivia Campbell-Hardy, 15, who was among the victims of the blast that killed 22 people at her concert on May 22.
"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'," she told the crowd.
"And then she told me Olivia would have wanted to hear the hits. We had a different show planned and we had a rehearsal yesterday and we changed everything."
Grande, who wore a white oversized One Love Manchester sweatshirt during the show at the Emirates Old Trafford cricket ground, thanked the crowd for "being so happy and strong and unified".
"This night is the kind of thing the world really needs right now," she added.
Highlights of the show included a surprise appearance by Mancunian Liam Gallagher, who was joined by Coldplay for a rendition of the Oasis hit Live Forever.
He dedicated the song "to the beautiful people who were killed and injured in the Manchester terror attack".
Gallagher ended his set by throwing his tambourine into the crowd.
Earlier in the night Coldplay joined Grande on stage to sing Oasis's hit Don't Look Back In Anger, which has been an anthem for Manchester since the tragedy.
During the show Grande duetted with Miley Cyrus on Crowded House's Don't Dream It's Over and was joined on stage by her boyfriend Mac Miller as they performed their collaboration The Way and Miller's track Dang!
Grande performed her duet Better Days with Victoria Monet and sang Where Is The Love? with Black Eyed Peas.
Other star performers included Pharrell Williams, One Direction's Niall Horan, Black Eyed Peas and Little Mix.
The show also saw performances from Take That and Robbie Williams, who led the crowd in a singalong to his hit Strong, with the lyrics changed to "Manchester, we're strong, we're strong, we're strong, we're still singing our songs".
While Katy Perry performed her hit Roar, saying: "We will not be silenced, Manchester."
Justin Bieber also took to the stage to perform for up to 50,000 people at Old Trafford.
After his performance viewers were treated to a heartwarming moment in the crowd as a policeman was seen dancing around in a circle with some children.
At the end of the concert Grande returned to the stage where she was joined by all of the musicians on the bill as she sang her song One Last Time saying: "Manchester, I love you with all my heart."
She then stood alone on stage to sing Over The Rainbow before breaking down in tears.
The concert was broadcast to over 50 countries across the world and raised over £2 million for the We Love Manchester Emergency Fund, set up to support grieving families and victims of the bombing.
Prior to Sunday's performance some of the choir children spoke to ITV News about their anticipation of the show.
Half way through their performance Ariana Grande appeared on stage to sing with them.
The emotional performance saw the 12-year-old soloist comforted by the pop star after she became overwhelmed and broke down in tears telling the schoolgirl "I'm so sorry".
Viewers took to social media to share their thoughts after the performance with one Twitter user saying "Ok when Ariana put her arm around that little girl I was gone".