Justin Bieber is clearly on a downward spiral...

The singer who was tossed from a nightclub in London on his 19th Birthday on Friday night, was booed by a crowd waiting for him to take the stage at London's O2 Arena.

Biebs was scheduled to take the stage at 8:30 p.m. but didn't appear till around 10:20 p.m.

He apologized on his Twitter:

"Last night I was scheduled after 3 opening acts to go on stage at 935 not 830 but because of some technical issues I got on at 10:10..so...I was 40 min late to stage.

He continued: “there is no excuse for that and I apologize for anyone we upset. However it was great show and I'm proud of that.”

Oh what will be next?!!

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