Catherine Zeta-Jones

Catherine Zeta-Jones has been treated for bipolar disorder, her rep says.

"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 this week on her two upcoming films."

Michael Douglas: My tumor is gone

No further details were released, but a friend tells People that the Oscar winner spent about five days at an unidentified facility.

Zeta-Jones, 41, had been at husband Michael Douglas' side during his five-month battle with throat cancer. He announced in January that his tumor was gone.