The pop sensation helped raise over 2.5 million euros when she returned to the UK to play a charity gig, just 13 days after the suicide bombing, which struck at her Dangerous Woman gig at Manchester Arena.
Grande shared the news on Instagram, saying she was honoured by the UK government's gesture.
"I don't know what to say. Words don't suffice. I'm moved and honored. My heart is very much still there. I love you. Thank you," she wrote alongside a note.
He added, "But no - instead she, as an artist, a performer, was determined that she would not perform again until she had returned to Manchester to perform.
"In doing so, she brought comfort to thousands, she raised millions for the We Love Manchester Emergency Fund and became the first patron of that fund. And that's why I propose that Ariana Grande is made the first honorary citizen of the city of Manchester.
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