The One Love Manchester benefit concert was held to honour and raise money for the victims and families who have suffered from the horrific act of terrorism on 22 May.
During her set, "Part of Me", singer Katy Perry told the crowd: "love conquers fear and love conquers hate, and this love you choose will give you strength and it's our greatest power", before asking the crowd to turn and hug the person next to them.
Robbie even changed the lyrics of his hit track "Strong" and during the chorus he sang: "Manchester, we're strong".
"I'll say this too about @ArianaGrande - she has a cracking voice".
Grande's concert was subject to a terror attack on May 22 where a lone bomber attacked the foyer of the Manchester Arena as Grande attendees were exiting the venue.
While her emotional performance melted hearts across the world, the huge rock on her ring finger did not go unnoticed and soon fans started speculating that the singer may have been engaged to the Divine Feminine album maker.
Raising his own arms, he added, "Put both hands up to honor those people right now".More news: Ariana Grande delivers for Manchester
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"Manchester we're strong ... we're still singing our song", he sang with the audience of 50,000.
She also talked about meeting the mother of a 15-year-old victim, Olivia Campbell, who died in the terrorist attack.
"And this is so lovely, you guys made that decision, you looked fear right in the face and you said "no we are Manchester and the world is watching".
"Today's One Love Manchester benefit concert will not only continue, but will do so with greater goal", Braun said in a statement.
She joined Coldplay to perform Oasis hit Don't Look Back In Anger, recalling how city centre crowds had spontaneously burst into a rendition of the song in the days after the Manchester bombing. "So, we're really looking to appeal that's going to move towards 10 million pounds", he told the Associated Press (via ABC News).
Her performance throughout the night carried heavy emotion and responsibility, yet she was composed and respectful, and showed grit and willpower by staging this show less than two weeks after those tragic events.