Lindsay Lohan: Just Like Old Times with Kourtney Kardashian, But We're Old(er)

Lindsay Lohan time warped back to the early 2000s -- partying hard late into the night ... with a Kardashian no less, but no one got arrested this time!

LiLo hung out with Kourtney Kardashian all over London on Wednesday night. The pair did dinner at Ours Restaurant, jumped over to Loulou's ... and topped off their night at Cirque le Soir.

Back in Lindsay's heyday, she and the Kardashians -- primarily Kim and Kourtney -- came up on the Hollywood nightclub party scene together before Linds moved on to the criminal court scene.

Now, 29-year-old Lindsay's got a fiance (Egor Tarabasov was there too) and 37-year-old Kourt has 3 kids -- but good to see they can still go hard. For a few hours.

In fact, looks like they ended the party by swapping dresses! Awesome.