Miller, 26, died of a suspected drug overdose.
Grande, who quickly became engaged to comedian Pete Davidson after splitting with Miller, did not immediately comment on the rapper's death but blocked comments on her Instagram page after a slew of critical remarks.
Minutes after reports of Miller's death surfaced, Grande's Instagram account was inundated with comments such as "this is your fault and 'you did this to him".
The pop star, who has remained silent since news of Miller's death broke Friday, posted a black-and-white photo of the rapper looking up at the camera Saturday afternoon. His death comes just four months after his split from Ariana and the "Love Me Harder" singer was forced to turn off her Instagram comments after trolls kept leaving her harsh comments of blame. Both players took to Twitter to express their personal sense of loss over Miller's untimely passing. He passed away from an apparent overdose on Friday (September 7) at his home in California's San Fernando Valley.
"This is one of my best friends in the whole world and favorite people on the planet, Malcolm McCormick", the 25-year-old "Sweetener" singer said with a snap of the pair holding hands.
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Grande at the time wrote on social media that she had long tried to help Miller become sober but described their relationship as "toxic" and said, "I am not a babysitter or a mother and no woman should feel that they need to be".
"Let's please stop doing that", she continued.
"I will continue to pray from the bottom of my heart that he figures it all out and that any other woman in this position does as well".
Ariana ended their two-year relationship in May. "Ariana is very upset".
Miller has been open about his trouble with substance abuse including an addiction to powerful cough syrup - known on the street as purple drank.