Justin Bieber Cancels Concert in Portugal

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Justin Bieber performs at Jingle Ball last year.

The singer pulls out of one of two shows in Lisbon "due to unforeseen circumstances."

Justin Bieber has canceled one of two upcoming concerts in Lisbon, Portugal.

"Due to unforeseen circumstances, Justin Bieber was forced to cancel the second operation, in Portugal, on 12 March," Portuguese promoter Everything Is New posted on its website. "The Canadian singer is eager to play for the Portuguese fans on 11 March." 

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The post added that ticketholders to the show, which was to have taken place at Pavilhao Atlantico, will receive a refund within the next 30 days.

A rep for Bieber confirmed the cancellation to E! News.

It hasn't been a good month for the singer so far. Last week, the singer fainted at backstage at a show at London's O2 arena and took a 20-minute break to receive oxygen. He was then rushed to the hospital.

A day later, an angry, F-bomb-dropping Bieber was photographed lunging toward photographers while being restrained by his bodyguard.

"Ahhhhh! Rough morning. Trying to feel better for this show tonight but let the paps get the best of me," he tweeted afterward. "Sometimes when people r shoving cameras in your face all day and yelling the worst thing possible at u...well I'm human."

A week earlier, Bieber celebrated his "worst birthday" in the British capital, bristling when pal Jaden Smith, the 14-year-old son of Will Smith, was turned away from London's Cirque du Soir nightclub. Outside on the street, Bieber removed his shirt, prompting actress Olivia Wilde -- who wasn't there for the festivities -- to tweet: "Justin Bieber, put your f---ing shirt on."