Some concertgoers clutched signs reading "For our angels" in tribute to the 22 people who were killed and dozens more injured when a suicide bomber set off a blast after Grande's concert at Manchester Arena on May 22.
Grande paid tribute to her fans, including Olivia Campbell, 15, at her One Love concert at the Old Trafford Cricket Ground on Sunday evening as concert goers proudly wore clothes emblazoned with the slogan, "We stand together".
"Manchester we're strong ... we're still singing our song", he sang with the audience of 50,000.
The show saw performances from big pop acts from both sides of the Atlantic, including local heroes Take That and Liam Gallagher, along with Pharrell Williams, Katy Perry, Justin Bieber, Little Mix, Coldplay, the Black Eyed Peas, and Grande. "All we feel here tonight is love, resilience, positivity", Williams said before he launched into his hit song, "Happy" with an assist from Miley Cyrus.
The proceeds from One Love Manchester go to the Red Cross' Manchester Emergency Fund, which has been set up to help victims of the attack and their families.
Grande, 23, told the crowd: "She told me Olivia would have wanted to hear the hits".
"I don't want to go the rest of the year without being able to see and hold and uplift my fans, the same way they continue to uplift me", Grande wrote.
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"I think the kind of love you're displaying is the kind of medicine the world really needs right now".
"We're here to show our support to Manchester more than anything".
Grande was all about love during the concert as her 25-year-old boyfriend Miller joined her on stage.
The singer was joined onstage by members of Parrs Wood High School's Harmony Choir, which included survivors of the bombing, which took place after her concert in Manchester on May 22, for a performance of her song My Everything, and she comforted one young singer who appeared to be overcome with emotion onstage.
The concert will be broadcast on a variety of outlets.
US President Donald Trump came under fire on Sunday for criticising London's mayor in the aftermath of attacks in the city that killed seven people and injured at least 48 others.
"We will not quit or operate in fear".