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Katy Perry FridayRebecca Black‘s so-bad-it’s-good anthem “Friday” may be the most-hated song ever on YouTube, but that didn’t stop Katy Perry from belting it out at her show on, well, Friday.

During her Friday show in Melbourne, Australia, Perry broke into a chorus of “Friday”, eliciting an eruption of cheers from those in attendance. Fans even joined in and sang along.

“I’m so glad that someone wrote a song about Friday – finally!” Perry told the audience.

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Rebecca Black revealed recently that she’s been receiving death threats due to the song’s popularity and even has police protection.

I guess it’s OK when Katy Perry sings it, though. Makes perfect sense.

Still, the cover made for quite the Kodak moment. Check out the video below.

http://www.youtube.com/watch?v=sM51ANnSgsU

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