Justin Bieber’s 19th birthday party was reportedly cut short because of Jaden Smith. A source has revealed to USMagazine.com that the Canadian popstar and his entourage got into an argument with security staffs that led to them having to leave a London nightclub on Friday night after just 15 minutes because they refused to let Jaden into the event because he is underage, according to Contactmusic. The 14-year-old actor – who is the son of Will Smith and Jada Pinkett-Smith -starred in ‘The Karate Kid’ remake. “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,” Contact Music quoted a source as telling USMagazine.com. The Baby singer spent 10,000 pounds for a circus themed bash at Cirque du Soir nightclub but it tuned out to be his “worst birthday” ever. After leaving the nightclub the group went to McDonald’s before returning to posh hotel, The Langham, where he is putting up during his time in the UK.