TMZ Live -- Dr. Arnie Klein ... Take Two

Dr. Arnold Klein has shown up at the TMZ offices to appear on TMZ live at 1:30 PM PT, 4:30 PM ET today.

Dr. Klein -- who bailed before his scheduled appearance on Tuesday -- promises to tell all about his most famous patient, Michael Jackson.

Dr. Klein will talk with Harvey Levin -- no restrictions.

Come back at 1:30 PM PT, 4:30 PM ET.