Justin Bieber Cancels Concert in Portugal

Justin Bieber is canceling one of his two scheduled shows this week in Portugal "due to unforeseen circumstances" ... this according to the website for the venue.

Bieber is scheduled to play the Pavilhao Atlantico in Lisbon on March 11 and March 12, but the site now says the second show is canceled.

A statement posted on the site (and translated thanks to the good folks at Google) reads, "Due to unforeseen circumstances, Justin Bieber was forced to cancel the second performance in Portugal, March 12."

It continues, "The Canadian singer is eager to play for the Portuguese fans on March 11. Holders of tickets valid for March 12 should contact the respective place of purchase to receive a refund within 30 days of the date of the scheduled concert, which ends April 11."

It's unclear what the unforeseen circumstances are, but he was hospitalized last week after collapsing backstage (though that wouldn't explain why he's canceling the SECOND show).

He also tweeted earlier today simply, "#sundayfunday."