Under terms of the agreement announced Wednesday, DeWitt will pay a $510 fine, serve three years of probation and participate in a nine-month alcohol-treatment program, the Los Angeles Times reported Thursday.
DeWitt was charged last July with driving under the influence and driving while having a blood alcohol level of 0.08 percent or higher, both misdemeanors, the Times said.
Officials say DeWitt's blood alcohol was 0.15 percent -- nearly twice the legal limit -- when she was arrested. Police said they arrested the TV actress after she drove around a barricade near the city's annual fireworks show.
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