Lindsay Lohan just showed up at the law office of
Blair Berk --- Lindsay's first lawyer -- to noodle over her felony grand theft case ... TMZ has learned.

Sources tell us
Shawn Holley and Lindsay decided to call Berk and ask her to review the evidence in the case and strategize with Lindsay. Sources tell TMZ ... Holley met with Lindsay and Dina for hours yesterday at Holley's office. That meeting was followed by a lengthy conversation between Holley and Berk, and the two decided Lindsay should continue the discussion with Berk today.
Holley is and will continue to be Lindsay's lawyer, but in this kind of a pickle, two heads are better than one.
Berk, by the way, is the lawyer who repped Lindsay when she got her 2 DUI's ... and managed to get her off with a legal slap on the wrist. One of the main reasons Berk is meeting with Lindsay -- she was the lawyer in the case the has now led to the probation violation.
It's likely Berk and Lindsay will discuss the D.A.'s plea offer, which would require her to accept 6 months in jail.
Oksana Grigorieva just lost her motion to keep the L.A. County Sheriff's Department away from the stuff in her computer ... in connection with the extortion investigation.

The judge told Oksana, "For me to begin to limit law enforcement functions in the investigation is premature at this time ... therefore this motion is denied."
Oksana's team was visibly upset with the decision.
The Sheriff's Department wants full access to O.G.'s computer, to determine if there's evidence she tried to extort Mel Gibson.
The judge complimented Daniel Horowitz on his "tenacity" but the Sheriff's Department was the clear winner.
The Sheriff's Dept. told Judge Gordon it hasn't even begun looking at the material in the computer. Investigators are trying to convert the material into a viewable format.
TMZ has learned ...
Mel Gibson's lawyer is meeting with Sheriff's investigators right now, presenting evidence she believes proves
Oksana Grigorieva has fabricated the case against her client.

The meeting is being held at a courthouse in Los Angeles, in a conference room.
In addition to presenting evidence that Mel did not strike Oksana, we're told attorney
Blair Berk will ask Sheriff's deputies to go after Oksana for extortion and falsifying evidence.
Berk's track record may be just what Mel needs. Last year she convinced New York prosecutors not to file felony assault charges against her client,
Kiefer Sutherland, after he
broke a dude's nose at a party. Berk also convinced an L.A. judge last fall to dismiss battery charges against
Kanye West, who was
caught on video breaking a camera.
After the meeting, we got video of Blair Berk and L.A. County Sheriff's Detective Tom Lewis. We asked Berk if
Oksana was guilty of extortion and lying to the cops. She said it was an "inappropriate question." Lewis was mum.

It's as if
Dennis Farina never went to LAX with a gun in his briefcase -- because you will never find a trace of legal action against the actor.
Farina's lawyer,
Blair Berk, just convinced a judge to allow the actor to withdraw his no contest plea to the reduced charge of entering an airport sanitary area with a weapon. The judge then expunged the charge from Farina's record, which was otherwise unblemished in his 64 years.
Berk told the judge, "not all mistakes should be prosecuted as crimes." Sometimes, a time out is enough.
A high-powered celebrity lawyer representing a doctor accused of being a sexual predator went after "Dateline NBC" yesterday in a California courtroom.
Blair Berk, whose clients include Lindsay Lohan, Mel Gibson and Halle Berry, is currently representing Dr. Maurice Wolin, a prominent oncologist. The doctor was taken down by cops last year as "Dateline" cameras rolled. Prosecutors say Dr. Wolin made plans to have a sexual encounter with someone on the Internet who he thought was a 13-year-old girl. In fact, the person who was IMing Dr. Wolin was self-proclaimed "evil vigilante" Xavier Von Erck, founder of Perverted Justice.
In yesterday's preliminary hearing in Santa Rosa California, Berk grilled a cop whose department worked with Perverted Justice and "Dateline." Berk maintained that Perverted Justice got money for snagging alleged predators and therefore entrapped her client to make a buck. She claimed Perverted Justice illegally recorded conversations with her client and also said the chat logs could not be authenticated. The logs have not been admitted into evidence.
The cop who testified yesterday called the chat logs "extensive" and "extremely incriminating." In one exchange, the doctor allegedly asked to come over to her house, but added, "But you're under 18 and I'm over. We would have to be soo careful."
NBC rented the house that was used for the doctor's alleged sexual liaison.
Xavier Von Erck will testify when the prelim resumes next month. The judge will then decide whether to admit the critical logs into evidence and then determine if Dr. Wolin will stand trial.