Looks like we'll be hearing this one ahead of schedule. Britney Spears is joined by Nicki Minaj and the chick responsible for penning the smash hit Ke$ha for the official remix to her chart-topping dance number off Femme Fatale. Listen below.

Listen: Britney Spears f/ Nicki Minaj & Ke$ha "Till The World Ends (Femme Fatale Remix)"

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