Ariana Grande is singing on Mac Miller's posthumous album 'Circles'

Ariana Grande has been incredibly busy on her Sweetener world tour, but the star has put aside some time for something she loves: Mac Miller.

WATCH: Fans are convinced Ariana Grande is singing on Mac Miller's posthumous album

The popstar has secretly recorded herself singing for her late ex-boyfriend Mac Miller's posthumous album 'Circles', and it's causing us ALL to cry.

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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."

Jason Bolaños on Twitter

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.