During a speech at the end of a performance of Where Is The Love he said "Manchester, London, we are here and we are together and we are one" and he also paid tribute to the emergency services "here in London". "I love you guys so much, and I think the kind of unity you're displaying is the medicine the world needs right now".
Concertgoers began queueing outside Lancashire Cricket Club's Old Trafford ground from 8.30am ahead of the gig, which marked Grande's first performance since bomber Salman Abedi detonated a device, killing her fans and parents as they left her show.
"She told me Olivia would have wanted to hear the hits", Grande said, before launching into her popular song "Side to Side".
A clutch of pop stars from across the globe - including Miley Cyrus, Katy Perry, Justin Bieber and Liam Gallagher - performed in front of 50,000 fans, and Beckham was invited to be a part of the event.
"Tonight is about remembering those that suffered so much on that night, but also celebrating the spirit of this great city".
"It's not easy to always choose love, is it?" she asked the crowd.
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. "This is Manchester.' Manchester, your bravery is our hope". "As unfortunately we saw yesterday, evil will test us, it will show its face again".
Tipping says: "We can't let them stop us".
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Braun said a TV broadcasting the concert was set up at Royal Manchester Children's Hospital, where some victims were still recovering.
Take That, who are from Manchester, followed with fun energy that the crowd danced to. "We want everyone to stand strong".
Greater Manchester Police Chief Superintendent Stuart Ellison said there would be a "significant number of officers" at the venue and encouraged people to leave bags at home.
Grande's concert was held at Emirates Old Trafford, an outdoor stadium about 3.5 miles from Manchester Arena, where the May 22 concert took place.
When Coldplay performed "Fix You".
The "One Love Manchester" benefit concert, organized by Ariana Grande and her team and featuring performances from Grande, Justin Bieber, Coldplay and several other A-list stars, kicked off today and is being broadcast in dozens of countries around the world. Authorities have said the attack started with a van plowing into pedestrians and then involved three men using large knives to attack people in bars and restaurants at a nearby market.
She shared some photos of the visits on her social media account.