Justin Bieber Injures Knee During Live Concert

11/12/2010 12:22 PM PST

Justin Bieber Injured -- Knee Injury During Live Concert

Justin Bieber was limping on stage at his concert in Cleveland last night -- and sources close to the singer tell TMZ his people are hoping it's just a bad sprain.

The injury occurred midway through the concert -- but we're told Bieber soldiered through the pain and finished the show.

Sources close to Biebs tell us they will know more about the injury today.

Story developing ...