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Tuesday, June 18, 2013 | 2:33 a.m.
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Posted: 2:11 p.m. Monday, Aug. 8, 2011
ETonline.com
http://www.youtube.com/watch?v=0nfvrnnZ8Oo
Whether you’re a fan of Rebecca Black’s viral hit Friday, it’s hard to resist Katy Perry's weekend duet with her Last Friday Night buddy, Miss Black herself.
Perry was performing at the Nokia Theatre at L.A. Live in Los Angeles, CA when Katy's special guest snuck onstage to the surprise and joy of screaming fans.
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