04/20/2011 at 01:00 PM EDT
is back in action and looking great.
The actress, 41, who revealed that she'd been diagnosed with and treated for
bipolar II disorder, is already back to work – and beaming.
Zeta-Jones appeared to be all smiles Wednesday on the Shreveport, Louisiana, set of the comedy Playing the Field
, which also stars Jessica Biel
and Gerard Butler
She's also already lined up her next project: Zeta-Jones has signed on to star in the film version of Rock of Ages
, PEOPLE confirms. She'll play the wife of the L.A. mayor, a conservative character who wants to do away with rock and roll, according to Deadline.com
For much more on this story, including details of Zeta-Jones's private struggle and how she decided to get help, pick up this week's issue of PEOPLE, on newsstands Friday
– Dahvi Shira