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Katy, 36, yelled his name to try to get his attention and tell him it was okay.
'Hunter!' she called out. 'That was the best performance you have ever given.'
Offering support: Katy Perry yelled his name to get his attention and tell Hunter it was okay
Turned away: Hunter was so overcome by his brief mistake that he turned away from the crowd in disappointment and shook his head as the show's live audience gave him a standing ovation
Tears flowing: The tears started flowing after Hunter forgot the lyrics at the end of the song
The young man seemed unable to listen or calm down, so she continued.