LeAnn Rimes Smiles with Family on First Red Carpet Since Leaving Treatment

By Tim Nudd

09/28/2012 at 08:30 AM EDT

Eddie Cibrian, LeAnn Rimes and Cibrian's sons Mason and Jake

Todd Williamson/Invision/AP

LeAnn Rimes was all smiles Thursday as she walked her first red carpet – actually, a black carpet – since leaving treatment for anxiety and stress, attending the Los Angeles premiere of Batman Live with husband Eddie Cibrian and his boys.

In keeping with the Batman theme, the Grammy winner, 30, was sporting a black dress and black boots, with a black clutch. Earlier in the evening, she posted a photo to Twitter, "channeling my inner Cat Woman" before the show.

Leann Rimes

Courtesy Leann Rimes

On the carpet, she and Cibrian, 39, firmly held hands as they posed for photos with Mason, 9, and Jake, 5.

All four had mustaches inked on their index fingers, and at one point they posed for photos laughing and holding up their fingers to their noses.

Rimes checked into treatment at the end of August, but took a break to uphold her commitment to perform some concerts in the Midwest. She has a number of shows scheduled for the next three months, beginning with a swing through New England in October.

Reporting by REAGAN ALEXANDER