Credit: Kevork Djansezian/Getty Images

Lindsay Lohan has surrendered to police.

Wearing a black leather jacket, jeans and shades, she arrived around 8:36 a.m. at Beverly Hills Superior Court Tuesday morning to be taken into custody and start a 90-day jail term for violating her probation in a 2007 drunken driving and cocaine possession case.

Her face was stern as she walked inside the courthouse, even as one fan tried to throw confetti at her and another held a sign that read "Free Lindsay."

Lohan, 24, was represented by her former attorney, Shawn Chapman Holley, who replaced Robert Shapiro, who quit the case late Monday just hours before the actress' court appearance (Holley said Shapiro was a consultant and was never her actual lawyer).

The actress appeared solemn as Holley and Judge Marsha Revel discussed the case.

At times, Lohan looked like she could break down in tears.

Mom Dina, sister Ali and estranged father Michael were all in court with her.

Lohan had been staying at the Pickford Lofts sober living facility (owned by Shapiro) for the past week, but learned she departed around 3:30 a.m. Monday with her mother Dina and former girlfriend Samantha Ronson.

“She’s scared," a source told Us of Lohan's mindset.

But that didn't stop her from Twittering to fans. In one message, she wrote: "(T)he only 'bookings' that i'm familiar with are Disney Films, never thought that i'd be 'booking' into Jail... Eeeks."

It is expected that Lohan will serve her time at the all-female Century Regional Detention Facility in Lynwood, Calif. (where Paris Hilton served 23 days of a 45-day sentence for violating her probation in a DUI case in 2007).

Lohan will first be photographed, fingerprinted and searched before being taken into her a 12-by-8 cell -- located away from the other 1,800 inmates -- which features two bunks, a toilet, sink, small tabletop and a narrow six-inch window.

The actress, who must wear a jail-issued jumpsuit, will spent her time in isolation in the cell, where she will eat all her meals.

Lohan likely won't spend 90 days behind bars. She could be released early due to overcrowding, but she is expected to serve no less than 23 days. (Still, that is more than the 84 minutes she spent in the slammer in 2006 for drug and alcohol cases filed that year.)

After Lohan is released, she must immediately complete three months in rehab.

No word on how jail and rehab time will affect her upcoming work gigs, which include Inferno, a biopic where she plays famed porn star Linda Lovelace.