Bieber's birthday bombs, star calls it the 'worst'

USA TODAY - It started out so sweet.

Justin Bieber seemed to have it all when he tweeted thanks to his fans for their birthday wishes on Friday. "Gonna be fun tonight," he wrote from London on Twitter. "Thanks to everyone for all the birthday wishes. 19!"

He even followed it up with another short tease: "Gonna be fun tonight."

But it looks like his party bombed. According to E! News, Bieber held a circus-themed birthday bash at London's Cirque du Soir with guests including his rumored new girlfriend, British singer Ella-Paige Roberts Clarke (sorry, Selena).

But the festivities didn't last long. According to Us Weekly, after a confrontation between Bieber's entourage and club security, Bieber's entire party left his own bash. The magazine cites the cause of the problem to be 14-year-old guest Jaden Smith, who was too young for club entry. But Gossip Cop has another explanation: Aggressive paparazzi got in his way.

"This is unbelievable," tweeted the star's pal Ryan Butler. "Can't even have fun on his birthday. Paparazzi are absolute (expletive) here."

Whatever happened, the pop star went straight back to his hotel.

And it seems to seriously have bummed out the Biebs. "Worst birthday," he lamented on Twitter.

(Copyright © 2013 USA TODAY)