Saved By the Bell Star Denies Bipolar Accusation

Lark's mother recently told People her daughter had been diagnosed with bipolar disorder -- but this week in L.A., Lark told us she finds the report "comical."

But the video is really bizarre -- Lark can't seem to complete a thought, taking abnormally long pauses and speaking nonsensically ... saying things like, "Well you know, people want to express themselves and ... you know, they will do so at free random."