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Lindsay Lohan fled a nightclub in tears after a confrontation with her ex- gal pal, Courtenay Semel, who has begged her to go to rehab.

The starlet stormed out of Brittny Gastineau's birthday party at Crown Bar in Los Angeles Wednesday night after coming face-to-face with Semel, who dated Lohan in 2007 but recently asked her to seek help.

A source said, "Everyone was trying to keep [Lohan and Semel] apart, especially since Courtenay is recently out of rehab and has pleaded with Lindsay to do the same.

"Everything was fine for a while, and Lindsay seemed happy, but then there was a confrontation when she came out of the bathroom, and she ran out in tears. Everyone fears she's on some kind of self-destructive collision course." Other guests at Gastineau's party included Jill Zarin, Nicole Murphy and Jamie Foxx.
A rep for Lohan said of her storming out, "That's news to me," while Semel's rep did not return calls.

Then, on Thursday night, despite pleas from her father, Michael Lohan, to go into rehab, Lindsay continued partying, joining up with Greek shipping heir Stavros Niarchos and staying out with him until 7 a.m. yesterday in LA.

Earlier in the night outside club Voyeur in Hollywood, she blasted her dad as an attention-seeker for releasing private recordings of her mother, Dina, sounding panicked about her condition. She told photographers, "Why don't you go find my dad, he's the one that wants the pictures," before heading to Niarchos' pad at about 2 a.m.

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Beverly Hills addiction counselor Marty Brenner told us, "Her dad is putting her in a scary situation. Getting her into rehab should be done quietly with love and respect, not by public criticism. He is just forcing her to rebel, and it's just a time bomb waiting to happen.