Paris Hilton completed the first night of her probation sentence as morning arrived Monday in her new surroundings - a Los Angeles County jail cell that will be her home for much of this month. The 26-year-old hotel heiress worked the red carpet at the MTV Movie Awards on Sunday afternoon, then traded her strapless designer gown for a jail-issue jumpsuit and a solitary cell. Hilton entered the Century Regional Detention Facility in Lynwood just after 11:30 p.m. to serve 23 days for violating her probation in an alcohol-related reckless driving case. She is due out on June 26. "It's hell. Go to jail and you'll find out," Alicia Singleton, 23, of Oakland, said Monday as she left jail after serving five weeks for a crime she refused to describe. Singleton said she and other inmates were asleep when Hilton checked in. Around 7 a.m., they learned Hilton was there when they watched the TV news. To most of them, it was no big deal. "Oh, Paris, Paris, Paris. If you do the crime you've got to do the time," Singleton said. Hilton surrendered after a surprise visit to the MTV awards. "I am trying to be strong right now," she told reporters on the red carpet. "I'm ready to face my sentence. Even though this is a really hard time, I have my family, my friends and my fans to support me, and that's really helpful." Sheriff's spokesman Steve Whitmore said Hilton was easy to work with. "Her demeanor was helpful. She was focused, she was cooperative," he said. Hilton, accompanied by her mother, Kathy Hilton, surrendered at the Men's Central Jail in downtown Los Angeles just after 10:30 p.m. She was then escorted to the women's facility in Lynwood, where she was booked, fingerprinted, photographed, medically screened and issued an orange top and pants, Whitmore said. Hilton's booking photo shows her wearing what appeared to be a V-neck shirt, eye makeup and lip gloss that highlighted a slight smile. Her blond hair was draped over one shoulder. Sheriff's deputies had released a mug shot taken last year after Hilton was arrested by Los Angeles police. That photo showed her smiling, in full makeup and with her head tilted to the left, with her blond hair flowing over her bare shoulders. The mistake was made because the sheriff's department and LAPD mug shots are in the same database, Whitmore said. "It was an inadvertent release." Hilton, star of the TV reality series "The Simple Life," is being housed in the "special needs" unit of the 13-year-old jail, separate from most of its 2,200 inmates. The unit contains 12 two-person cells reserved for police officers, public officials, celebrities and other high-profile inmates. Hilton's cell has two bunks, a table, a sink, a toilet and a small window. She does not have a cellmate. Like other inmates in that unit, Hilton will take her meals in her cell and will be allowed outside the 12-by-8-foot space for at least an hour each day to shower, watch TV in the day room, participate in outdoor recreation or talk on the telephone. No cell phones or BlackBerrys are permitted in the facility, even for visitors.