It's been nine months since Mac Miller tragically passed away at the age of 26 following a fatal overdose.
Though a highly acclaimed musician in his own right, outside of the hip hop community, Miller was likely best known for his relationship with Ariana Grande.
Though they had broken up several months prior to his death, Miller's passing was, by all accounts, a devastating blow for Grande.
She's publicly paid tribute to the late rapper several times, most famously in the lyrics to her hit single "Thank U, Next."
On Wednesday night, Ariana sang the song live in Mac's hometown of Pittsburgh.
It was her first time doing so, and the performance clearly took quite an emotional toll:
As you can see in the clip above, Ari got choked up and was unable to complete the line "wish I could say, 'Thank you' to Malcolm" (Miller's real first name).
The crowd quickly realized what was happening and cheered in encouragement.
Ari's backup singers filled in until she was unable to continue the song with her inimitable light soprano voice.
Fans in attendance say Grande was also overcome with emotion while performing the night's opening number "Raindrops (An Angel Cried)."
An empty seat was reserved for Mac toward the front of the stage and prior to Ariana's performance, a medley of his greatest hits was pumped through the speakers of the PPG Paint Arena.
It makes sense that Mac's passing would be such a sensitive subject for Grande -- but apparently, members of her inner circle have become concerned by her recent displays of emotion.
“Of course her family is worried," a source close to the situation tells Radar Online.
"She has so many things on her plate and she has been trying to juggle everything while trying to also have some semblance of a personal life," the insider adds.
“Ariana has been so hot and cold lately and no one knows which version of her they are going to get and right now she is more unpredictable than ever.”
Sounds like a difficult time for the beloved pop icon -- but given how much she's been through in the past, we're sure she'll make it through.
Our thoughts are with Mac's loved ones as they continue to mourn the passing of a once-in-a-generation talent.