London, England () -- Singer Justin Bieber kept thousands of fans and their tired, outraged parents up way past their bedtime Monday after arriving on stage nearly two hours late for a sold out show at London's O2 Arena.

Bieber was greeted by choruses of boos from the sell-out crowd amid scenes of tearful devastation as scores of sobbing school-aged "Beliebers" were hauled away minutes into the singer's set by parents desperate to catch last trains home on a school night.

Sleep-deprived fans and their parents, many of whom shelled out more than $150 a ticket for the gig, lent new meaning to the term "Bieber fever" as they blasted the 19-year-old Canadian pop idol in Twitter tantrums as "lame" and "disgusting" following last night's debacle.

Impatient fans waiting for the so-called "Prince of Pop" were further enraged by the apparent constant repetition of the King of Pop's greatest hits ahead of Bieber's set.

But for many fans all was forgiven when, in typically understated fashion, the singer finally fluttered onto the stage attached to a huge set of wings before eventually taking his top off to the delight of throngs of screaming Beliebers.

Maybe it was all the screaming and crying, or maybe it was that he didn't make it on stage until about a half hour before he was supposed to finish, but there were more than a few fans with Bieber hangovers today -- although for a lucky handful with cool parents, it did have its side benefits.

Bieber took to Twitter and his 35 million-plus followers to apologize, calling last night's delay inexcusable, and pledged to be on time for his next London gig on Tuesday.

http://www.cnn.com/2013/03/05/showbiz/j … ?hpt=en_c1