Signs of trouble? Mischa Barton takes a hit while behind the wheel.

Mischa exhales and the smoke swirls around her.

Mischa Barton was arrested for DUI, possession of narcotics and driving without a valid license in 2007.

Mischa heads to another party spot with a gal pal.

Mischa crams into the back of a cab with friends.

Another long night of partying leaves Mischa looking unwell.

Mischa looks rather dazed during this awkward moment.

What are you hiding behind those dark glasses, Mischa?

Mischa Barton does not look summer fresh at the launch of Harrods Summer Sale.

Mischa heads into a club as a friend carries a bottle of liquor behind her.

Mischa looks rather worn out as a friend drives away from the Chateau Marmont.