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Now that Lindsay has been released from the Betty Ford Center in Rancho Mirage to start her post-rehab life in Venice Beach, it appears Lilo's next door neighbor is a familiar face ... her ex Samantha Ronson. Problem is, SamRo is pissed!

Just last month Ronson moved out of her West Hollywood apartment complex ... the same building that Lindsay called home. Turns out the two are neighbors once again, but this time in Venice Beach.

Our videographer just spoke with Sam and she told him she JUST found out Lindsay was moving her stuff in next door! Our guy tells us, "Sam seemed so annoyed. She really seems sick of Lindsay stalking her."

Doesn't sound like there'll be a welcome mat rolled out for Linds anytime soon. Check out the gallery below to see photos of Lindsay's new Venice pad!

Stay tuned for video of Samantha ...