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Last Updated: Wednesday June 02 2010 12:53 GMT

Bieber and Will Smith's son duet

Justin Bieber

Popstar Justin Bieber has recorded a duet with Will Smith's 11-year-old son Jaden.

The track, called Never Say Never, is the theme to the new Karate Kid movie, which Jaden stars in.

It's the first time the pair have teamed up, and in the song Justin sings the main melody while Jaden performs backing vocals and a rap.

The video shows the two boys dancing about and eating red liquorice, while watching bits of the movie.

It's not the first time Justin's teamed up to do a duet.

He's just released a single called Eenie Meenie with reggae star Sean Kingston.