Lindsay Lohan thrown out of Ronson party!

Drama queens Lindsay Lohan and Samantha Ronson were in rare form Friday night, playing out perhaps one of their final acts together.

Sammy was DJ’ing at a party for her sister, designer Charlotte Ronson, at LA’s Bar Marmont when Lindsay apparently made an uninvited appearance!

According to OK! Magazine, Lindsay knew she was not welcome, but decided to crash the party anyway.

Sources tell OK! that the doormen were under strict instructions from the Ronson family to look out for Lindsay and not to let her in – under any circumstances.

The party officially ended at 11pm on Friday, but an hour later, Sam was still spinning records inside, while Charlotte, their brother Mark — whose band played an hour-long set at the event — and their mom, Ann Dexter Jones partied on.

But just as expected, Linds still showed up, only to be “restrained from coming in by five security guards,” according to an onlooker. “Lindsay knew she was unwanted, but came anyway, to no avail,” said another source.

While LiLo couldn’t get beyond the guardians at the gate, other celebs, including Nicole Richie, Molly Sims, Sting and Jewel, had no problem getting into the event. Even Paris Hilton was welcome. The celebutante arrived around 10:15pm on the arm of her boy-toy Doug Reinhardt. “She really seemed to be glowing!” one partygoer tells OK!.

It was a second night in row that Lindsay had displayed some odd and seemingly unwelcome behavior. On April 2, also in L.A., she suddenly popped up onstage in the middle of pal Lily Allen’s show — only to be all but ignored by the British pop star.

Perhaps this latest break-up is the real thing, even though earlier this week, while promoting her new fake tanning product, Lohan assured reporters that she and Ronson were still together.I think what’s different about this fight is that it’s Ronson that has had enough of Lindsay’s craziness this time.