Gallagher, formerly of Oasis, earned loud cheers from the audience as he emerged in his home town in surprise form.
Katy also had pictures of the victims printed on the back of her dress in a display of solidarity.
Miley Cyrus paid tribute to Grande's friendship and support of her charity, the Happy Hippie Foundation. "So I want to thank you for being just that". But love conquers fear and love conquers hate.
Sunday's concert will raise money for victims of the attack that struck at Grande's show on May 22. "All we feel tonight is love, resilience, and positivity". Her oversized white sweatshirt reads "One Love Manchester" in graffiti writing, and provided the comfort we're sure she needed on this hard night.
"I don't want to feel or hear or see any fear in this building", USA singer Pharrell Williams told the crowd as he led them in a rendition of his hit single Happy.
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An emotional Grande, who mostly kept it more about the music, did have a brief comment for the audience when she thanked everyone for "coming together and being so loving and strong and unified".
Cyrus said she was "so honored to be at this incredible event" and performed "Happy" alongside Pharrell, who also sang "Get Lucky".
"I just want to take a second to look around at all of you." she said, pausing to talk to the crowd.
'Good even Manchester, ' singer Gary Barlow screamed.
"Manchester, we're strong, we're strong, we're strong.
And this is so attractive", Grande's manager, Scooter Braun said from the stage in reference to the horrific terror attacks in London last night (June 3).
Some fans questioned whether Sunday's show would go on after three men drove a van into a crowd on a London bridge Saturday night before leaping out and stabbing numerous people in nearby bars and restaurants.
The "One Love" benefit will be streamed from midday AEST on Sydney's KISS FM and airs tonight on Channel 9 at 8:40pm AEST.