Justin Bieber Calls Out 'Dummies' For 'Worst B'Day' Ever

It had all the makings of the most epic 19th birthday
 party ever. Justin Bieber had just finished a great show in Birmingham, England, on Thursday night and was going to celebrate with an b-day blowout
 at a London nightclub on Friday.

"Big night ahead," he tweeted that morning. And then, inexplicably, less than 10 hours later, came the tweet retweeted 'round the world: "Worst birthday."

The circus-themed party at London's Cirque du Soir nightclub reportedly ended with a confrontation between Bieber's entourage, which prompted the singer and his crew to leave. Bieber took to Instagram on Sunday to explain what went wrong, blaming the club for messing up what should have been a fun night out with his pals.

"The funny moment when people believe I brought underage people to a club," he wrote, seemingly alluding to British reports that 14-year-old Jaden Smith and new crush, 17-year-old singer Elle-Paige Roberts Clark, were in his group.

"U think Will is letting his 14 year old in a club, I don't think so. 2nd I love how the club wanted to give the press another reason to why we didn't stay at their weak ass club so they wouldn't look bad for me walking in and right back out. I said m 'worst bday' but that was due to dummies pushing over my fans and being overly aggressive. Btw it wasn't the worst bday cuz all my friends from back home flew in I was just mad in the moment."

According to E! Online, security at the club thought some of the members of Bieber's entourage looked a bit young and refused them entry after they were asked to show ID.

"We, like all clubs in London, operate a strict age policy," a club spokesperson told the site. "As a few of the members of the party were under the suitable age of 18, the security team at Cirque Du Soir, London, clearly explained this rule and refused entry to the club for anyone who could not provide us with adequate proof of age."

An unnamed source told Entertainment Weekly, "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."

Perhaps there was some good to come of all the commotion. According to a tweet from Buzzfeed's Andrew Kaczynski, the phrase "Worst Birthday" is now the third most re-tweeted tweet in the history of Twitter.