First Look at Glee Season 4, Episode 9: “Swan Song” — Rachel and Kate Hudson's Cassie Have a Dance-Off! (VIDEO)

Better watch out, Cassie (Kate Hudson), Rachel (Lea Michele) is ready to take you down! The two NYC divas have a dance of in Glee Season 4, Episode 9: “Swan Song” — set to "All That Jazz" from Chicago. Who do you think will come out of it the winner?

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