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(Yahoo!) - Following Justin Bieber's hospitalization, the "Beauty and a Beat" singer had to cancel an upcoming performance.

"Due to unforeseen circumstances, Justin Bieber was forced to cancel the second performance in Portugal," a rep for the singer confirms.

Bieber was set to play a show on March 12.

On Thursday, the 19-year-old singer fainted while performing in London.

"He took a twenty minute reprieve and was given oxygen," Bieber's rep told omg!.

While Bieber is on the mend, he has still been making headlines for his dramatic trip to the U.K..

On Friday the superstar launched at the paparazzi. “I’ll f**king beat the f**k out of you," Bieber said to a photog.

The singer then reacted on Twitter:

"Ahhhhh! Rough morning. Trying to feel better for this show tonight but let the paps get the best of me," he wrote. "Not gonna let them get the best of me again. Gonna get focused on this show tonight. Adrenaline is high now. Gonna put it on the stage."


Photo Credit Splash News