While Ari isn't officially credited on his song "I Can See," fans are convinced that it's her voice in the background.
"@arianagrande can be heard harmonizing in the background of #macmiller’s new song, “I Can See” from his posthumous album #Circles ," wrote one fan.
"'I Can See' is my new favorite song by Mac Miller from #Circles and I’m not 100% sure if it’s her, but it sounds like Ariana Grande has some vocals in the background harmonies. It sounds amazing."
It's definitely something the star would do, seeing how much she has honoured Mac Miller since his tragic death. Not only has she tributed him multiple times, but she has also even been 'liking' tweets about his new album.
As expected, fans were really emotional on Twitter.