Prepare Thyself: Miley Cyrus & Justin Bieber Duet!

Justin Bieber had a massive concert last night at Madison Square Garden in New York that was filmed for his upcoming 3-D biopic, due in theatres next year.

There were a slew of guest stars, including Usher and Ludacris and Boyz II Men, but the creme de la creme of them all that got the crowd roaring was his duet with Ms. Miley Cyrus.

The 17-year-old joined the Biebs on his song “Overboard,” with them playing coy and touching each other – sans any sexuality of course. Check out a short vid from a concert-goer!

Bieber had sweetly tweeted earlier: “Its all really coming 2gether. Tonight I perform with my heroes! MSG its almost time!”

Check out Bieber in his infamous white outfit and his purple sneakers…I want to know how many of these white outfits he has hanging in his closet.