Justin Bieber cancels show in Portugal: Is he okay? A string of odd behavior concerns fans

justin-bieber-yellow-hat-getty.jpgJustin Bieber has canceled an upcoming concert in Portugal on his "Believe" tour due to low ticket sales. Yes, you read that right: Apparently, Justin Bieber is having trouble selling tickets to a show. After an eventful, scandal-filled week in London, Bieber has decided to perform only one show in Portugal, canceling the expected second gig.

It's an odd decision for a guy who claims to be all about the fans -- and it follows up a string of strange behavior from the pop star, who just turned 19.

The weird antics began on Wednesday, when Bieber stepped out in an outfit that can only be described as bizarre. His yellow hat could double as a weapon, and was so outlandish that it sparked a series of obsessive tweets by "Lost" creator Damon Lindelof. The next day, Bieber roamed the streets of London -- in the winter, mind you -- wearing no shirt and saggy leather pants.

"Bieber, put your f***ing shirt on. (unless you lost all your shirts in a fire in which case my condolences and please purchase a new shirt)," actress Olivia Wilde tweeted. Bieber said he was just sweaty.

Then came the "worst birthday" debacle, when Bieber allegedly tried to get a 14-year-old into a nightclub and threw a tantrum when he was refused entry. Okay, so the 14-year-old was Jaden Smith -- but still. Fourteen.

That Monday, Bieber hit the stage at the O2 at 10:15 p.m. -- which irritated waiting fans, because tickets said he'd hit the stage at 8:30. Some fans left before he arrived, because they had to catch the last train.

Later that week, he was spotted wearing a gas mask around London, perhaps as some sort of disguise... though it wasn't exactly the best way to detract attention.

Thursday, he collapsed on stage and had to rush backstage so that emergency personnel could administer oxygen. He continued his show after a ten-minute breather, but had to be rushed to the hospital after the concert.

Following the hospitalization, Bieber lost his cool with a paparazzo. His bodyguard jostled a paparazzi while Bieber was getting into his waiting car, and when the paparazzo reacted to being shoved, Bieber got out of the car and lunged at him, yelling, "I'll f***ing beat the f*** out of you!" Naturally, it was all caught on video.

Should we be worried about the little pop prince? Is he experiencing a post-breakup spiral while Selena Gomez dances her blues away? Is he about to shave his head and wield an umbrella as a paparazzi weapon? Weigh in below in the comments section.
Photo/Video credit: Getty Images