Justin Bieber turned 19 years old on Friday (Mar 1), and the teen superstar had a big $20,000 birthday party planned to celebrate it. But his party plans were reportedly ruined after his entourage got into a fight with security at the venue where it was being held … prompting the Biebs to tweet “Worst birthday.”

The sad tweet from the Biebs came just hours after he tweeted about him being en route to celebrate his birthday following his concert in Birmingham, England.

And boy did he celebrate. According to an E! News report, the singer partied with his rumored girlfriend Ella-Paige Roberts Clarke and other friends in a circus-themed birthday bash at London’s Cirque du Soir Friday night (Mar 1) until the wee hours Saturday morning.

Things were going pretty good too … that is, until security had to be security and go and ruin everything. Someone who was at the party told E! Online that Justin’s entourage got into a confrontation with club security, and Bieber’s people — including all of his party guests — were asked to leave.

No official word on what exactly the “confrontation” was about, but the source said that it all happened very quickly, and the birthday boy ran straight to his hotel in tears. Just kidding (about the tears). Justin Bieber is a big boy now, and big boys don’t cry. But he did tweet this:

And what do the Beliebers think about all of this? Well, they’re pretty pissed. But of course they’re pissed. Justin’s birthday was ruined!

Twitter immediately lit up with angry tweets from Beliebers, who blamed the paparazzi — and oddly not the nightclub bouncers — for ruining Justin’s night, citing some bizarre story about the paps following Justin to the party, breaking his umbrella and hurting “my boo Jaden Smith.”

Justin later took to his Twitter to respond to the support he received from his army of fans:

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