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Actress Catherine Zeta-Jones has returned to a treatment center for bipolar II disorder and will reportedly complete another 30-day program, which her rep says was a ‘proactive’ decision.

Zeta-Jones, 43, has “proactively checked into a health care facility,” her rep confirmed to People magazine.

The stunning actress revealed in 2011 that she suffers from Bipolar II, which can cause episodes of depression lasting days, and sometimes intense mood swings.

“This is a disorder that affects millions of people and I am one of them,” Zeta-Jones told People mag at the time. “If my revelation of having bipolar II has encouraged one person to seek help, then it is worth it. There is no need to suffer silently and there is no shame in seeking help.”

In April of 2011, the “Chicago” actress revealed she was undergoing treatment at a Connecticut hospital, citing the stress of her husband Michael Douglas’s throat cancer battle as a source of depression and anxiety.

“After Michael had his cancer, and I had my issues, I had to like stop for a moment,” she said on Good Morning America last year.

According to TMZ, which first reported her return, Zeta-Jones is slated to complete another 30 day treatment program. A source close to the actress said her decision to check into a facility is simply “maintenance,” instead of reactionary or sudden. 

“There was no big problem,” the friend told People. “This was just a good time to do it. She is in between projects. This has always been part of the plan. She would manage her health. She is vigilant about it.”

Zeta-Jones’s rep, Cece Yorke, also confirmed to the mag that the actress prefers to maintain her health.

“Previously Catherine has said that she is committed to periodic care in order to manage her health in an optimum manner,” said Yorke.

Zeta -Jones and Douglas, 68, recently attended an awards gala together at Lincoln Center looking happy and healthy. Over the weekend, on April 27 the “Traffic” actress stunned on the red carpet for the White House Correspondents Dinner.

While Douglas is preparing for the Cannes Film Festival debut of his HBO Liberace biopic “Behind the Candelabra” in May, Zeta-Jones’s next film, action flick “Reds 2,” opens in July.