Bieber Booed [VIDEO]

Poor Biebs! After his 'worst birthday' ever, he's getting booed by his own fans!

The Biebs was two hours late for his gig at the O2 Arena in London! The arena said the cause for the delay was for 'unforeseen reasons.' He was probably stuck on a 4 Pictures 1 Word puzzle. The video above is the restless crowd at the O2. I also searched far and wide to find more Bieber Boo moments!

Here's the Biebs getting booed at Madison Square Garden at a Knicks game: