NEW MUSIC: Britney Spears featuring Nicki Minaj and Ke$ha: "Til The World Ends (Remix)"

Well... here it is.
Tourmates Britney Spears, Nicki Minaj team up with Ke$ha (the writer of the song)
to KILL this remix. I'm really diggin' it.
I wonder if Ke$ha's vox are from her demo...
Thoughts? Comment below!

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