By Clark Collis
Updated August 16, 2010 at 04:12 PM EDT

Image Credit: Janet Mayer/PR PhotosKaty Perry crashed a prom in Melbourne, Australia, last Friday and sang along to “California Gurls.” According to Radar, the prom was taking place at the Grand Hyatt, where Perry was staying, and the singer decided to attend the event after hearing her hit being played.

“As she grabbed the microphone, she was surrounded by highly excited students and began singing along,” said one student. “She was dancing and laughing with students until the end of the song. Everyone went nuts and it was the perfect ending to our evening.”

Perry later tweeted, “I totes just crashed a prom!!!”

Would you appreciate Katy Perry crashing your party? Is there a celebrity you would rather have turn up uninvited?

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