Katy Perry performs with kids choir

Katy Perry performed a special version of 'Firework' with children's choir PS 22.

Katy performed the track as part of Oprah Winfrey's Ultimate After Oscar Party  on Monday (February 28th).

She took a break from her European tour to fly into Los Angeles' Kodak Theatre for the performance.

'Today was such a beautiful day,' she Tweeted 'PS 22 & Oprah made ME feel like a firework...reforcused me & reminded me of my purpose. Thank you.'

See footage from the performance below

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