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10 May 2018, 12:23
The couple have parted ways after a year and a half of dating.
The musicians, who have been dating since 2016, have decided to call time on their relationship but reportedly remain "the closest of friends".
As for the reason for the split, the publication say Ariana and Mac "quietly cut off their romantic relationship" after their work schedules became "too busy".
While the ex-couple "love each other dearly", they will continue to do so just as close friends. Grande initially announced that pair were officially an item in September 2016.
During the course of their relationship, the pair have collaborated on a number of songs including Grande's breakout song 'The Way' and Miller's 2016 track 'My Favourite Part'.
Just last month, the rapper tweeted his admiration for his then-girlfriend in the run-up to her upcoming album, 'Sweetener', which drops in July.
"Very proud of this girl right here. Welcome back. We missed you," he wrote. "One of a kind."
very proud of this girl right here— Mac (@MacMiller) 20 April 2018
Welcome back. We missed you.
One of a kind. https://t.co/aUJC9UL9fb
Both Grande and Miller are yet to respond to the reports.