But most recently, fans at both Little Mix and Shawn Mendes' concerts are singing Ari's song "One Last Time" together, and honestly it will give you chills.
There is footage from Ariana's Manchester concert where she sings the song, and watching it now, knowing what happens, makes is so much more sad.
But seeing the fans come together with their celebrity idols like this is really, really beautiful.
Watch them below <3
Little Mix actually sung the song along with the fans too...