The tragic rapper would have turned 27-years-old on Saturday.
Grande showed her feelings just after mid-night when she tweeted 'miss u' in honor of her former love.
And she followed that up by posting a personal black and white image of them having fun in a recording studio together via Instagram Stories.
Grande has been paying respects to Miller since he died both on social media and through song.
Sources say that the 25-year-old Florida native has struggled to come to terms with his shocking death.
Miller died of an accidental overdose at his home in Studio City, California on September 7, 2018.
The rapper ingested a fatal combination of fentanyl and cocaine and fell unconscious.
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