Sick Usher Walks Off Stage, Booed by Fans (Video Below)

Its been a bad week for Usher.

The R&B star was forced to cancel a concert in Berlin on Wednesday due to illness, and despite rescheduling the show for the following night, he was not firing on all cylinders.

I was ill and felt that I would not have been able to give that show that you all properly deserve, Usher wrote of the cancelled show.

Determined not to disappoint his German fans, Usher rescheduled the show for Thursday night.

But Thursdays show at the O2 World Arena in Berlin wasnt the full-on spectacle that the singer, nor his fans, were expecting.

Usher lip-synched his first two songs and danced poorly to them, according to local tabloid B.Z. Restless, some fans reportedly began to boo, at which point Usher lowered his head, blew the crowd a kiss, tossed his mic to the floor and left.

A few minutes later the stage lights came on, and an announcement made that Usher was too sick to perform.

A statement released by Ushers rep said the singer is suffering from upper respiratory illness which is currently preventing him from performing a proper show. After consultation with doctors, he has been advised to reschedule the upcoming dates in order to get the rest he needs to ensure a complete recovery.

Usher added in a statement, I deeply regret having to reschedule the shows. I am truly sorry for any inconvenience I have caused my fans. My fans are the best in the world and I am looking forward to getting better so that I can give them the show they deserve.