Tuesday, March 1, 2011 11:50pm ET by  
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Katy Perry surprises PS22 Chorus

The PS22 Chorus, an elementary school choir that has become a worldwide phenomenon thanks to their YouTube videos, got quite a surprise this week when a very special guest joined them on stage.

After a heartfelt rendition of ‘Somewhere Over The Rainbow’ at Sunday night’s Oscars, the following day the chorus was due to perform Katy Perry’s ‘Firework’ at ‘Oprah’s Ultimate After-Oscar Party’ in the Kodak Theatre.

Little did they know Perry had flown in from Austria especially to surprise them.

Watch what happened here: