It seems all but one of the Hollywood socialite set attended the bash for Charlotte Ronson's Sephora cosmetics line.
So was Sam's former girlfriend left off the list?
It certainly sounds that way, according to an insider.
"Sam was there with her new girlfriend, Erin Foster," a partygoer tells me. "They're annoyed because Lindsay called the police a few days ago when they were having a party at Sam's apartment to complain about noise. She got the party shut down."
The onetime couple are next-door neighbors in Venice.
When I asked Lindsay's rep if she was or wasn't invited to last night's soiree, he told me he wasn't sure, adding, "It's not the kind of thing we spend time discussing."
As for whether Linds got Sam's house party busted, he says, "This is non-news if it even happened."
This wouldn't be the first time Lohan was a persona non grata at a Ronson fete.
Two years ago, she was denied at the door during Charlotte's party at Chateau Marmont.