Justin Bieber's "worst birthday" party

Uh.. A not so happy birthday for Justin. In fact.. he tweeted: “Worst birthday.” What happened?

According to Eonline, Justin Bieber holds a circus-themed birthday bash at London’s Cirque du Soir for his 19th birthday with guests including British singer (new rumored Bieber-girl) Ella-Paige Roberts Clarke.

Report says a confrontation occurred between Justin’s entourage and club security, prompting Justin’s entire party to leave. The incident went down very quickly and Justin headed straight back to his hotel afterward, the source adds.

Meanwhile Alfredo tweeted: “I’m disgusted. I remember this day all to well 2 years ago in LA. It just won’t ever quit. Wish he [Justin Bieber] could just have a few hours…”