Mischa Barton's younger sister Hania suffered a drug overdose the same day The O.C. star was caught for drunk driving. Wannabe actress Hania Barton, 19, was rushed to Los Angeles' Ceder's Sinai Medical Center on December 27th suffering convulsions, reports National Enquirer.

A source tells the tabloid, "The family bodyguard found her obviously overdosed on drugs, called her mother, and then rushed Hania to the emergency room. It was a suicide attempt, and by the time she got to hospital, Hania was absolutely hysterical."

The Enquirer claims Barton confessed to overdosing on the muscle relaxer Soma; was treated for six hours before insisting on being discharged. She was accompanied by her elder sister, who just twelve hours earlier was arrested for driving under the influence and possession of drugs.

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(This news article provided by World Entertainment News Network)