Hollie Booth, 13, performed a dance routine to a medley of songs, which included Ariana Grande’s song One Last Time.
The teenage survivor returned to the city for her Britain’s Got Talent audition and was joined by friends who borrowed wheelchairs in a show of support.
The group of dancers performed under the name Rise and wore T-shirts with the Manchester bee on the front.
The contestant survived the attack after her aunt Kelly Brewster shielded her along with Hollie’s mother Claire.
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“This is the first time I’ve been anywhere that’s like an arena. It’s hard.”
Their audition received a standing ovation from the audience and panel.
Simon told the group: “You’ve come on and shown what you’re made of.
This will inspire a lot of people. I salute you!”
Hollie suffered two broken legs while Claire was left with a broken jaw as 22 people were killed last May when Salman Abedi detonated a bomb at the venue.
At the time, Booth’s uncle Paul Dryhurst described how her aunt Kelly, 32, died while leaving the arena.
He explained: “Kelly has shielded Hollie and Claire from the damage.
The three were walking out in single file, with Claire in front, Hollie behind her, and Kelly behind her.”
Pop-star Ariana and a whole host of international stars descended on Manchester last June to perform at a One Love Manchester benefit gig less than two weeks after the attack.
The concert was organised by the 24-year-old singer and included performances from Justin Bieber and Robbie Williams.