As you know, Catherine Zeta-Jones has been filming Playing the Field in the SBC... but that's not why she's been making headlines. This week, actor Michael Douglas sat down for an interview with Oprah Winfrey, during which he shed more light on wife Catherine Zeta-Jones' recent stay at a mental health facility, where she was being treated for bipolar II disorder.

In the interview airing Tuesday, Douglas said his own personal issues may have contributed to Zeta-Jones' depression.

"My oldest son is in federal prison, my ex-wife is suing me, and I got cancer. It's kind of hard for the wife to say, 'I'm depressed,'" he said, according to ET Online. "So I think that, you know, really probably played a big part of it."

Douglas also added that his wife is doing much better since seeking treatment. "She's great, she's shooting a movie down in Louisiana, and I think she's relieved that she has a better understanding [of bipolar II]," he said.

Zeta-Jones, who in 2003 won a Best Supporting Actress Oscar for her performance in 'Chicago,' reportedly spent about five days in a mental health facility before heading back to work on a movie.

"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. She's feeling great and looking forward to starting work this week on her two upcoming films," her rep told PEOPLE.

[ET Online]