Karate Kid star Jaden Smith will be joining Justin Bieber on stage in Madison Square Garden for a concert later this month.

Will Smith's son, who rapped on Bieber's 'Never Say Never' track for the Karate Kid soundtrack, will join Bieber for the concert on 31 August, according to the New York Post.

A source said: "Special security arrangements are being made for Jaden, who will appear on stage, and his family, including Will, to be in the audience for the concert."

Other celebrities likely to be at the event include Sean Kingston and Jessica Jarrel.

Sound like mega-fun? Who has tickets?

Check out our pictures of Bieber on stage...