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Lindsay Lohan Image Credit: Rex Features

Lindsay Lohan looked calm and in control on Sunday as she arrived at an AA meeting in Hollywood.

But friends are claiming that underneath the calm exterior, the actress is panicking about what is going to happen to her after she failed two mandatory drug tests.

Wearing a stripey short playsuit with a black hat and black boots, Lohan even managed a smile at one point.

But according to TMZ, the Mean Girls star is "beating herself up" over the tests, one of which tested positive for cocaine.

Her friends also say Lohan "feels like she just ruined all these really great opportunities that were coming her way."

And it looks like the actress should be worried about the effect this will have on her career.

Her role as Linda Lovelace in upcoming biopic Inferno will be in serious jeopardy if judge Elden Fox refuses Lohan permission to travel.

Unsurprisingly, producers of the film are said to be at the end of their tether where Lohan's problems are concerned and are "beyond irritated by the recent developments", stating "concern of her commitment to the work."