Britney Spears just launched the second single, "Till The World Ends," from her upcoming Femme Fatale album and it's nothing short of massive! The song was penned by Ke$ha and produced by Dr. Luke and this sucker has Win! Win! Win! written all over it. Start clearing out a space in your head for this chorus now, because whether you like it or not, it's going to be stuck in there for the foreseeable future.
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