Zeta-Jones spent five days at a treatment facility in April seeking help for her condition, and has since returned to work.
"She's great!" Douglas told Us Weekly on Thursday. "She's down in Miami doing Rock of Ages, the musical."
"She's doing great. She's doing a great job," he added.
Douglas also said that once the actress finished work on the Adam Shankman film, the couple planned to celebrate by holidaying together in Spain.
The actor has previously praised his wife for seeking help for her issues.
In addition to filming Rock of Ages, Zeta-Jones is also due to begin work on the Gabriele Muccino comedy Playing the Field.