A “scared” but resolute Lindsay Lohan began a 90-day jail sentence Tuesday, trading nightclubs and Twitter messages for a small, isolated cell and an orange jumpsuit. Lohan, 24, was booked into an all-female jail in south Los Angeles for violating her probation on two 2007 drunk-driving and cocaine possession charges. The actress is likely to serve just 14 days behind bars, said Steve Whitmore, spokesman for the Los Angeles County Sheriff's Department, which runs the jail system. The “Mean Girls” actress, whose promising career has foundered during two years of strenuous partying, looked tired and tense during a brief, silent appearance at a packed Beverly Hills courtroom Tuesday morning, where she was handcuffed and taken into custody. She will wear a standard orange jumpsuit, hand in any jewelry, and cellphones and computers are banned. Lohan, who has voluntarily spent the past week in a sober living facility in Los Angeles, will serve her jail time alone in a 12 ft by 8 ft (nine square-meter) cell for her own safety. Lohan seemed philosophical about her plight on Monday. “(T)he only ‘bookings' that i'm familiar with are Disney Films, never thought that i'd be ‘booking' into Jail... eeeks,” she wrote on Twitter Monday evening.