LeAnn Rimes' jaw popped out of place mid-performance in Oklahoma

LeAnn Rimes apologized to Oklahoma fans for an abrupt end to her Saturday concert -- her jaw popped out of place.

"Oklahoma!!!! I love you so much! I'm sorry for no encore. I had my jaw pop out of place & I can't hear out of my left ear. #tmjsucks," Rimes tweeted after the show.

Rimes, 31, suffers from TMJ, or temporomandibular joint disorder, which causes problems with the joints connecting the lower jaw to the skull.

"Had it since I was 16," Rimes told a fan after the show.

She also blogged about the disorder in 2012, when she wrote that she had been "living in a dental nightmare for 10 months."

[Us Weekly]