Ariana Grande Shares Loving Post About Pete Davidson Grande and Davidson are Instagram official after Davidson posted a photo of the two in “Harry Potter” costumes yesterday. On Thursday, it was Grande’s turn to flaunt their new relationship with a PDA-filled photo. Ariana Grande, via Instagram Grande was previously dating rapper Mac Miller but the two called it quits earlier this month. She later referred to the 2-year relationship as “toxic” when accused of being responsible for Miller’s recent DUI arrest. Ariana Grande, via Twitter