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And it always seems to go down at the Chateau Marmont!

First LiLo was banned from Sam's sister's party there, but then showed up at a suite in the hotel anyway, and last night she waited outside the Chateau for Sam to come out!

Stalker much?

Lindsay left the tattoo parlor (Shamrock Tattoo) around 1 am and ventured down Sunset to the Chateau Marmont in a limo... hiding in the back. Sam was inside at a private party, and LiLo waited out in the limo until Sam came out.

And THEN the limo followed Samantha's car into the night! WTF, right?

Of course, Lindsay maintains that the troubled relationship is "not over" (check out the vid below!), so maybe this is just something couples -- nope, nevermind, it's weird!

La Lohan has been exhibiting erratic behavior recently and this is simply another example of it. Someone needs a vacay!