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19 October 2012, 17:37 | Updated: 19 October 2012, 17:40
The US star performed her song 'Firework' backed by child pianist Jodi DiPiazza to raise money for charity.
Katy Perry performed an emotional duet with a girl suffering from autism at a charity event this week to raise money for the cause.
The 'Teenage Dream' singer sang on stage with young pianist Jodi DiPiazza, who was diagnosed with autism at the age of two, who both sang and performed on a grand piano.
"I will never forget last night," Katy tweeted earlier today fresh from the event (19th October). "It was the most important moment thus far of what I do. Jodi is my firework."
Katy and Jodi's duet drew a huge round of applause and standing ovation after they finished singing Katy's hit single 'Firework', with host John Stewart having to take a second to compose himself before continuing with the charity benefit.
Check out a picture of Katy Perry on the charity event's red carpet this week below (Credit: Getty):
The Night Of Too Many Star benefit took place at the Beacon Theatre in New York City, and aims to raise money towards educational programmes for those suffering from autism.
Katy has been staying New York for the past week where she has been spotted out several times with US singer-songwriter John Mayer, whom she is believed to have been dating for the past few months.
Katy Perry's duet with Jodi DiPiazza on Night Of Too Many Stars is set to air on US network Comedy Central on 21st October.
Watch Katy Perry's charity duet with young pianist Jodi DiPiazza at the event below: