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​Britney Spears and Iggy Azalea's new track is out

Britney Spears and Iggy Azalea's new single leaked a couple of days ago -- but now their collaboration is officially.

Called "Pretty Girls," the song -- released Monday -- is a pop/rap track features lyrics like "Is it true that these men are from Mars/Is that why they be acting bizarre?"

Both stars took to Twitter about the collaboration:

The single surfaced just days after Spears fell onstage during her Vegas gig, forcing her to postpone some shows.

Tell us: What do you think about the new collaboration?

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