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Eddie Cibrian, LeAnn Rimes

Paul A. Hebert/FilmMagic

Holy night out, Batman!

LeAnn Rimes looked happy and relaxed as she and her family turned up for Thursday night's Los Angeles premiere of Batman Live, her first red carpet since checking into rehab a month ago for treatment for anxiety and stress.

Wearing a black dress and black boots, the 30-year-old country star was accompanied by her 39-year-old hubby Eddie Cibrian and his two kids with ex-wife Brandi Glanville, 9-year-old Mason and 5-year-old Jake. The giddy clan offered up their best fake-mustache impression to photographers.

Before the show, Rimes took to Twitter to inform her followers she was in a frisky mood.

"Channeling my inner Cat Woman for Batman Live," the hitmaker tweeted, adding a twitpic of herself dressed as the Caped Crusader's famous feline foil.

Rimes later gave the performance a thumbs-up.

"Incredible show!!! Batman was fab!," she added.

The crooner took time out from treatment to play a Sept. 20 benefit for VH1 Save the Music Foundation's Songwriters Music Series in Napa, Calif. She is scheduled to kick off a new tour in West Wendover, Nev., on Oct. 5  that will run through the end of the year.