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Justin Bieber Sings Rebecca Black's 'Friday,' Britney Spears' 'Baby One More Time' (Video)

9:08 PM PDT 3/30/2011 by THR staff

The pop singer launches into a few bars of both songs at a recent concert before performing his own hit "Baby."

Rebecca Black's "Friday" has been seen more than 67 million times on YouTube, and it seems that Justin Bieber might be among those viewers.

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