Lindsay Lohan Tuesday began serving her 90-day California jail sentence for skipping an alcohol education class following a court appearance in Beverly Hills.

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Lohan, 24, was jailed for failing to comply with the terms of her probation for a 2007 driving under the influence conviction. Due to the nature of her original crime and prison overcrowding, however, she is not expected to spend the entire 90 days in jail.

The Los Angeles Times cited an unnamed Sheriff's Department source as saying Robert Shapiro, who agreed to defend the "Freaky Friday" actress last week, is no longer Lohan's lawyer.

The attorney who was part of the team that successfully defended O.J. Simpson against murder charges had initially said Lohan would comply with all the judge's orders in the case.

Lohan had also been staying in a sober-living facility Shapiro founded since last week. It is unclear when she left the facility.

Despite Shapiro's departure and her own imminent incarceration, Lohan took to Twitter Monday to update friends and fans on how she's feeling.

"The only 'bookings' that I'm familiar with are Disney Films. never thought that I'd be "booked" into Jail ... eeeks," Lohan tweeted.