If you’re twelve or under then there’s a very, very strong possibility that you are obsessed with both Justin Bieber and Miley Cyrus. There’s also a very good chance that the thought of seeing these two ultimate tween stars performing on stage together would send you into some kind of pre-teen, hormone frenzy resulting in some very high pitched screaming, manic arm waving, and general over-excitement. If that’s the case for the your own saftey and that of those around you, you probably shouldn’t watch this. Miley Cyrus joined the Biebster on stage at New York’s Madison Square Garden just two nights ago as part of the recording for Justin’s upcoming 3D movie. They sing a duet of Overboard - although you probably won't hear much of it over the screaming.