The 23-year-old is holding the concert to honour and raise funds for victims of the Manchester attack following her gig on May 22. Today we stand together. "You guys made that decision, you looked fear right in the face and said, we are Manchester and the world is watching".
Sunday's "One Love Manchester" concert, to be held at the city's Old Trafford cricket ground, comes the day after attackers targeted the heart of London, killing seven people.
"Barlow welcomed former Take That bandmate Robbie Williams to the stage as "our friend, our brother", before the foursome took a bow together and Williams 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".
The families of a young couple killed in the Manchester terror attack have sent their "love and condolences" to the relatives of people affected by the London Bridge terror attack, and said their "hearts are aching" for their loss. "I encourage you to choose love, even when it's hard".
The large crowd fell silent at the start of the concert to remember those who were killed and injured in both Manchester and London.More news: US Will Continue to Reduce Greenhouse Emissions, Says Rex Tillerson
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"Tonight has been filled with love and fun and bright energy, so thank you for that". In the last week alone, at least 90 people were killed in a suicide bomb attack in Kabul in Afghanistan, 28 in a shooting in Egypt, 31 in vehicle bombings in Iraq, and seven in the London Bridge attack.
They also praised the work of the Greater Manchester Police and Northumbrian Police forces and expressed their gratitude to nurses and members of the British Red Cross who had supported them "during [their] darkest hours".
Justin Bieber turned out to be the biggest rock star and unifier at Ariana Grande's One Love Manchester concert. which proved one of the most moving moments of the night as he broke down onstage.
He explained that there will be more armed officers at the concert, additional security checks, and bag searches, and suggested that attendees not bring a bag if they can.
"We're deeply saddened to hear about last night's horrific attacks in London and our thoughts are with everyone affected, including the emergency services responding to the incident", Shewan said. "So that is what it will continue to do for us".