Catherine Zeta-Jones treated for bipolar disorder!

Catherine Zeta-Jones is facing up to her demons.

The Welsh actress who has been by husband Michael Douglas‘ side during his cancer fight apparently sought treatment for Bipolar II disorder.

“After dealing with the stress of the past year, Catherine made the decision to check in to a mental health facility for a brief stay to treat her Bipolar II disorder,” her rep said in a statement.

“She’s feeling great and looking forward to starting work this week on her two upcoming films.”

Bipolar disorder, a mental illness marked by elevated or irritable moods alternating with periods of depression, afflicts about 6 million Americans. Those with Bipolar II tend to have more depression, with the mood swings spread over a longer time and the “up” periods less elevated. The episodes can be triggered by major stress or life changes.

“There’s no question it’s been a stressful year,” a source said.

“Catherine has had deal with Michael’s illness and that’s been hard. She went in for a few days because she’s about to start working, and wanted to make sure she’s in top form, which she is.”

Meanwhile, a source told the National Enquirer that Catherine “checked into rehab under the alias of Terrie Kirny. Michael was with her when she was dropped off.

“She was in the detox center with 10 to 15 other people.”