Jennifer Aniston! Scarlett Johansson & Joseph Gordon-Levitt! Olivia Wilde! See what happens when Hollywood heads north
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Updated: Monday Sep 16, 2013 | 11:05 PM EDT
By: Alison Schwartz
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We'll clap along to this duet! Knightley and Levine hit all the right notes at Saturday's premiere of their film, Can a Song Save Your Life?
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