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Amy Poehler Singing Katy Perry's "Firework" (Video)

Video: Amy Poehler Karaoke, One Direction in the Men's Room, & More Viral Videos!

It's time for another round of the most popular viral videos featuring celebrities! This week, we have a cover of Katy Perry's "Firework" courtesy of Amy Poehler, a very young Anna Kendrick singing show tunes, and the boys of One Direction — in the men's room?! All that plus a nod to one of our favorite '80s movies are in today's PopSugar Rush.

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