Justin Bieber is lining up a special treat for fans at his New York City show next week (31Aug10) - he's reportedly planning an onstage collaboration with his pal Jaden Smith.

The Baby hitmaker teamed up with The Karate Kid star to record Never Say Never for the film's soundtrack and the young friends are said to be keen to make their live debut together.

Will Smith's son has now agreed to join Bieber when he plays at Madison Square Garden on 31 August (10), along with other celebrity guests including Sean Kingston and Jessica Jarrell, according to New York Post gossip column PageSix.

A source tells the publication, "Special security arrangements are being made for Jaden, who will appear onstage, and (for) his family, including Will, to be in the audience for the concert."