LOS ANGELES — A day that began with authorities confirming Lindsay Lohan was being investigated for battery on a female staffer at a California rehab facility treating the starlet ended with the worker fired after giving an interview about the incident.

Riverside County sheriff’s detectives said Tuesday they are investigating the “Mean Girls” star for an alleged altercation with a worker at a Betty Ford Center facility in Palm Desert that occurred after 1 a.m. on Dec. 12.

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Dawn Holland — whom TMZ interviewed Tuesday afternoon — wrote her report 6 hours after her showdown with Lindsay at Betty Ford. Holland says during the heat of the argument, Lindsay “threw the phone … I threw up my left hand to block it and then she grabbed my right hand and tried to snatch the phone that I had up to my ear, then called me a ‘C__T B___H.'”

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AP/LOS ANGELES – Lindsay Lohan is under investigation for an alleged misdemeanor battery against a female staffer at a rehab facility where the actress is receiving treatment, authorities said Tuesday.

Riverside County sheriff’s Deputy Herlinda Valenzuela said officers responded to a Betty Ford Center facility in Palm Desert on Dec. 12 shortly after 1 a.m. for an incident involving Lohan.

Valenzuela says a female staffer reported having a dispute with the “Mean Girls” star and that she wanted to pursue charges. No arrests were made and Valenzuela says detectives continue to look into the case.

Their results will be presented to Riverside County prosecutors, who will decide whether to file a criminal case, Valenzuela said.

Messages for Lohan’s attorney, Shawn Chapman Holley, were not immediately returned. An e-mail message seeking comment from a Betty Ford spokesman was not immediately returned, although the facility does not comment on its patients.

Lohan has been receiving treatment at the Betty Ford Center and its facilities, about 120 miles east of Los Angeles, since late September.

A judge overseeing her probation for a 3-year-old drunk driving case has required Lohan to remain at the rehab center until Jan. 3.

Los Angeles Superior Court Judge Elden S. Fox has scheduled a hearing on Lohan’s progress for Feb. 25. He has said he would be willing to place her on informal probation and allow her to leave Los Angeles if she stayed out of trouble until then.

Lohan’s stint at Betty Ford is her fifth stay in rehab and her second this year. Fox agreed to release her early from treatment at Ronald Reagan UCLA Medical Center in late August, but she failed a drug screening within weeks.

Fox opted to send her back to rehab rather than jail, where she would have been released early due to overcrowding.

The battery investigation was first reported by celebrity news website TMZ.

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