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Last night Lindsay Lohan had one of her typical late nights, but this time, it included a house party at her pad at 3 am!

Lindsay started the night at the Chateau Marmont where she stayed until 2:40 am. She left with a group of friends and had her assistant drive by Villa, but she didn't stop there. She and her four pals arrived at Lindsay's place at 3 am.

Only minutes later we spotted Samantha Ronson arriving with her sister Annabelle -- the one who gave Lindsay a lift home from Teddy's the night before -- but since Linds and Sam LIVE IN THE SAME BUILDING (stalker!), that's not too unusual.

We're not surprised that Samantha played coy with our questions. After all, Monday night she wouldn't even look at Lindsay as she walked by her ex sitting in Sam's car next to her own sister!

We doubt Sam joined in Lindsay's fun but whatever Lilo was doing up in her pad, it was clear it was gonna go on all night. Our photographer tells us:

    "I was waiting at Lindsay's to see if she'd come out again but by 4:30 am, I couldn't hang on any longer. Lindsay's got a lot more stamina than I do! All the lights were still on in her apartment -- she and her friends were clearly going to pull an all-nighter!"