The 7 Rings singer hit the stage at the PPG Paints Arena in Pittsburgh for the latest stop on her Sweetener World Tour, and according to Us Magazine, the star was visibly overcome with emotion throughout the performance.
He had dated Ariana Grande for two years before parting ways in May 2018.
Ariana Grande has anxious her family after she "broke down on stage" while singing a tribute to late rapper Mac Miller.
He was romantically involved with Ariana, though they had split up by the time he died but it still hits the 25-year-old singer hard, and she once again shed a tear for him during a performance in Pittsburgh, Mac's hometown.
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Ariana went one step further with her remembrance and made sure to leave an empty seat reserved for Mac at her concert.
Grande became visibly emotional, claims a Twitter user, and stopped singing the song. Grande's single "Thank U, Next" references her famous exes, and includes the lyrics, "Wish I could say, "Thank you" to Malcolm / 'Cause he was an angel".
Back in September of previous year, a source who spoke with Entertainment Tonight said Grande was heartbroken by the news; Mac's death really hit her hard.
They said: "Of course her family is anxious". When Ariana Grande sang those words at her concert last night she broke down on stage and couldn't continue singing the rest of the lyrics.