Katy Perry
She's determined to leave the feud in the past.
Including A-list guests, saucy revelations and a touching reunion with an old pal.
'It’s not easy to always choose love, especially in moments like these, right?'
Everyone has pulled out the stops to make it happen.
She'll be hitting the stage with a host of other A-list stars.
Fans who attended Ariana's Manchester Arena gig can go for free.
Katy Perry and Coldplay are among the other acts who will perform.
Many stars have made gestures of support.