Douglas, 68, spoke to People magazine on Monday while promoting his HBO film Behind the Candelabra
at the 66th Annual Cannes Film Festival in France. "She's doing a really good job of getting balanced. I'm proud of her," he said.
Zeta-Jones, 43, proactively checked into a treatment facility for the second time in April for bipolar II -- a milder form of the disorder known to cause mood swings and erratic behavior. She announced her diagnosis in 2011 and first underwent treatment at Silver Hill Hospital in Connecticut.
Speaking about his role as the iconic Liberace in Behind the Candelabra, Douglas said his wife is already a fan. "She loves it -- it cracks her up. She thinks it's a great movie."
Zeta-Jones can next be seen in the action sequel Red 2 -- also starring Bruce Willis, Helen Mirren, Anthony Hopkins and John Malkovich -- which opens July 19.
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