Justin Bieber and Jaden Smith: The late-night, bowling alley dance-off

After appearing at Bieber's August 31 concert at Madison Square Garden -- which apparently had quite the roster of guest stars -- TMZ reports Smith joined the singer at Manhattan's Lucky Strike Lanes & Lounge.

When Kevin Rudolf's "You Make the Rain Fall" came on, the boys got down to business, showing off their moves for everyone at the private party. And though witnesses say they both "killed it," Bieber's moonwalk secured the win for him.

Not satisfied by these grainy images? TMZ also says Bieber's documentary crew got the whole thing on tape, so one day you might just be paying to see it in 3D.

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Photo: TMZ