ONTD

That didn't take long! Word has it Lindsay Lohan's ex-girlfriend Samantha Ronson already has moved on to someone new.

According to a spy at the Chateau Marmont (site of that Ronson party from which Lohan was banned last Friday), the hot DJ was "clearly with another woman -- somewhat of a Lindsay look-alike, but with very dark hair," at that event.

"They sure looked very cozy, if you know what I mean," said the hotel source who was at the party.

Another Ronson pal reports a mystery woman named ''Cindy'' -- and matching the description of the Ronson date at the Friday night fete -- was seen coming out of Ronson's Los Angeles home on Sunday.

As for the deeply distraught Lindsay, she's currently being comforted by her mother, Dina Lohan, who suddenly has popped up in Los Angeles after being mostly absent from the LiLo scene in recent months.

"She's back to straighten out Lindsay ... and hopes to get her back into rehab, or at least some kind of counseling," said a former Lohan assistant.

A source told The New York Post Thursday: “Lindsay needs to get psychiatric help. Her friends are really sad for her, but she’s out of control, and now she’s all alone.”

There have been a number of reports Lohan has been seen drinking again, though the actress denies she's fallen off the wagon, even in the face of her relationship collapsing.

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