Jaden Smith cut short Justin Bieber`s birthday party?

Los Angeles: Actor Jaden Smith reportedly ruined teen pop sensation Justin`s Bieber`s 19th birthday celebration.

The 14-year-old actor is the son of Hollywood star couple Will Smith and Jada Pinkett-Smith. The youngster was allegedly responsible for the Canadian pop star and his entourage`s confrontation with security that led to them having to leave a London nightclub after just 15 minutes because they refused to let Jaden into the event because he is underage, reported Us magazine. "There was never any mention of Jaden being there, so when he showed up, it caused problems. They could have stayed if Jaden left, but Justin wanted to be loyal to his good friend," a source said. Bieber deemed it his "worst birthday" ever after he forked out 10,000 pounds for a circus themed bash at Cirque du Soir nightclub. PTI