Before rehab comes . . . kickball?

Lindsay Lohan -- who is slated to enter court-mandated rehab on May 2 -- was spotted in a surprising place on Wednesday night: a recreational kickball game on the Lower East Side.

A witness told us that Lohan and two pals unexpectedly moseyed over to the game, held at a school on Stanton Street, around 10 p.m., surprising the adult players -- to say the least.

"They were just hanging out, watching the game," the spy dished.

After the game, Lohan -- wearing a tank-top, tight pants and high boots -- was "really cool" as she chatted with the kickballers, but didn't want to pose for photos, the witness said.

In March, the 26-year-old was sentenced to 90 days in a treatment facility for charges stemming from a car crash in California last year.

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