Credit: David Tonnessen/

Lindsay Lohan attended an AA meeting in West Hollywood on Saturday -- the same day she admitted to failing a drug test.

Wearing a short, striped dress, black hat and black boots, the actress, 24, smiled as photographers snapped her photo.

Of her failed drug test, she wrote on Twitter: "This was certainly a setback for me, but I am taking responsibility for my actions and I'm prepared to face the consequences."

She was released from rehab Aug. 24 after serving nearly two weeks in jail in a DUI case.

She could wind up back in the slammer.

Superior Court Judge Elden Fox has yet to set a hearing.