The 25-year-old singer thanked "beautiful human" Ariana, 23, for inviting them to perform at the star-studded gig. "I expected better from her".
'All week you have been incredible and as a friend, I'm so proud of you my love.
Another said: 'This is an accurate representation of me when you performed this song'. One injured fan attended her concert on Sunday.
Perry added that is not easy to choose love in hard moments like this, but this feeling conquers fear and hate. The benefit concert organized by Ariana Grande, was to honor the victims of the attack perpetrated in the same city a few days earlier.
After the gig, Gallagher tweeted, "What an incredible night last night pure love vibrations nobody comes close to Manchester love forever LG".
Justin Bieber - who also performed at the event - makes an appearance at number two, featuring in Luis Fonsi and Daddy Yankee's track Despacito.
Following the events of May 22, Ariana returned to the United Kingdom to visit with survivors recovering in hospital and meet with the victims' families.
Fans Stacie Richardson and James Bend say there were shaken after the May 22 attack at Manchester Arena. Other performers included Little Mix, Niall Horan, Imogen Heap and Victoria Monet.
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