Catherine Zeta-Jones has returned to treatment for her Bipolar Disorder. Her rep tells People magazine, Catherine has proactively checked into a health care facility. Previously Catherine has said that she is committed to periodic are in order to manage her health in an optimum manner. The actress checked in on Monday and is reportedly completing a 30 day stay that's more on a maintenance level. This isn't the first time the 43-year old has spent time in treatment. She completed a program in a Connecticut mental health facility back in 2011.