As LeAnn described, the condition is lifelong, and often manifests in flare-ups triggered by stress.
She rang in the New Year performing in front of a large crowd in Times Square, the Emotions singer belted our her song but a technical glitch with the backing track left her red-faced and unable to lip-sync her way through the set.
She was caught out by the paparazzi as she boarded a plane in - well let's just say.
It gets in your head.