Justin Bieber, Miley Cyrus Justin Bieber, Miley Cyrus

Miley Cyrus and Justin Bieber have collaborated on a new song, and it's called — of course — "Twerk."

An unofficial version of the song, also featuring Bieber's friend Lil Twist, was released Wednesday, days after Cyrus' much-discussed duet with Robin Thicke at the MTV Video Music Awards this past weekend. It's unclear whether this is the final version of the song, or whether it will be featured on Cyrus' upcoming record "Bangerz."

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"Twerking" is having quite a moment. The Oxford English Dictionary announced Wednesday that it had added the word. (For the record, the Oxford definition is "[dancing] to popular music in a sexually provocative manner involving thrusting hip movements and a low, squatting stance." 

Check out Miley and Justin's track below. What do you think of the song?