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On Wednesday, Lindsay Lohan stepped out for the first time since leaving rehab.

In her hand as she walked through a Beverly Hills parking garage: ROCKSTAR, described on the company's website as "the world's most powerful energy drink."

Should the 24-year-old actress -- now in UCLA's outpatient program and undergoing psychotherapy treatment -- be downing the beverage? Like all energy drinks, ROCKSTAR is loaded with caffeine (and sugar) which can make her jittery, cause insomnia and increase anxiety. (An 8.4-ounce energy drink serving contains 280 mg of caffeine, compared with about 100 mg per 6 ounces in coffee.)

Lohan was a no-show Wednesday night at the L.A. premiere of her latest big screen effort, Machete. (Earlier in the day, a judge ordered her to reside at her Los Angeles home.)

"God bless her," actor Don Johnson told "I care about her as a person."

Said actor Danny Trejo, "She's in control, she is professional, and she can really bring it. She is going to be all right.”

Director Robert Rodriguez told Us he suspects the actress' spirits will be lifted after she watches her new movie.

"I can't wait for her to see it!" he told Us. "She is going to be very happy. This is the best thing for her right now, to see this movie."