Miley Cyrus and Justin Bieber showed fans at his Madison Square Garden concert, how a duet should be done.

Miley, who wore a tight LBD on stage gave it her all when she performed the song Overboard with Justin for his upcoming 3D movie.

If you're a fan of Miley AND Justin, then this video is just what you need to see...

HDTVJustinbieber1 caught the pair performing..

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Ooo-er Miley....